Unlock your potential with the NCERT Solutions for Class 7 Science Chapter 1 - Nutrition in Plants. Expertly crafted by our team of educators, these solutions align seamlessly with the latest CBSE Class 7 Science syllabus, ensuring that you are fully prepared to excel in your upcoming examinations.

Unlock your potential with the NCERT Solutions for Class 7 Science Chapter 1 - Nutrition in Plants. Expertly crafted by our team of educators, these solutions align seamlessly with the latest CBSE Class 7 Science syllabus, ensuring that you are fully prepared to excel in your upcoming examinations.
Practicing with these NCERT Solutions is the key to achieving academic excellence. These solutions have been thoughtfully designed to provide a comprehensive understanding of the vital topics covered in this chapter, particularly plant nutrition. By utilizing these meticulously prepared solutions, you not only increase your chances of scoring well but also enhance your ability to retain and apply this knowledge for the long term.
&nbsp;
In NCERT Class 7 Science Chapter 1, students are introduced to the vibrant world of plants that surrounds them. This curriculum is enriched with a diverse range of projects, fostering an enjoyable learning experience. Through this chapter, students become acquainted with new terminology and concepts, igniting their enthusiasm for studying.
This "Nutrition in Plants" chapter delves into various facets of plant nutrition, revealing how plants obtain sustenance. Students delve into the intricate process of photosynthesis, wherein plants prepare their food, learning about essential elements such as chlorophyll and stomata. The chapter also explores alternative modes of nutrition in plants, including insectivorous plants.
Furthermore, students gain insights into the fundamentals of plant nutrients and food production. A thorough understanding of this chapter lays a strong foundation for comprehending more advanced botanical concepts in higher grades. Hence, it is highly recommended for students to compile notes for effective revision during exam preparations. These notes can serve as quick references when needed. The NCERT Solutions for Class 7 Science Chapter 1 offer a valuable resource for grasping complex botanical topics.
Additionally, students discover how nutrients are replenished in the soil, especially the conversion of atmospheric nitrogen into a usable form. The Rhizobium bacterium's role in this process is highlighted. To excel in their exams, students should also work through previous years' questions and sample papers. This practice aids in understanding the exam pattern and the marking scheme.
For comprehensive academic support, including Class 7 Science materials, turn to Orchids. Our user-friendly platform offers an extensive array of NCERT Solutions and educational resources. Download our app to access a wealth of enriching educational content.
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 1 &ndash; Nutrition in Plants Exercise Questions</h3>
1. Why do organisms take food?
Solution:
All organisms require energy for their life processes. Plants prepare their food and acquire nutrients from abiotic components like soil, air, water and sunlight. On the other hand, animals need to get food from either plants or other animals to obtain nutrients; hence, animals need to take food to acquire nutrients and energy.
2. Distinguish between a parasite and a saprophyte.
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="245"><col width="344"></colgroup>
<tbody>
<tr>
<td>
Saprophytes
</td>
<td>
Parasites
</td>
</tr>
<tr>
<td>
Acquire nutrients from dead and decaying matter.
</td>
<td>
Parasites live on or in a host and get their food at the expense of their host.
</td>
</tr>
<tr>
<td>
Example: Fungi
</td>
<td>
Example: Roundworm
</td>
</tr>
</tbody>
</table>
</div>
3. How would you test the presence of starch in leaves?
Solution:
Take two potted plants of the same kind. Keep one in the dark for 72 hours and the other in the sunlight. Perform the iodine test with the leaves of both plants as given below. Now, leave the pot, which was earlier kept in the dark, undisturbed for 3&ndash;4 days and perform the iodine test again on its leaves.
Iodine test:
Put iodine solution on the leaf.
Observation:
Blue-black colour will be observed on the leaves of the plant kept in sunlight, which indicates the presence of starch.
Blue-black colour will not be observed on the leaves of plants kept in the darkroom. This indicates the absence of starch.
4. Give a brief description of the process of synthesis of food in green plants.
Solution:
Green plants use a process called photosynthesis to prepare their food. The process is as follows
<ul>
<li dir="ltr" aria-level="1">
Water is taken from the roots of the plant, and it is transported to the leaves of the plant.
</li>
<li dir="ltr" aria-level="1">
Carbon dioxide from the air enters the leaves through pores called stomata. This diffuses the cell containing chlorophyll.
</li>
<li dir="ltr" aria-level="1">
Water molecule is broken down into Hydrogen and Oxygen with the help of sunlight.
</li>
<li dir="ltr" aria-level="1">
Hydrogen combines with Oxygen and Hydrogen to form carbohydrates.
</li>
<li dir="ltr" aria-level="1">
Photosynthesis is represented by the following equation.
</li>
</ul>
<img title="Photosynthesis equation" src="https://lh7-us.googleusercontent.com/OrpwUG2bnLJiARRiZwuFzvFzzFgzx7dDzBkLnQTufGSUvvRCyJb99pvBdRvFGhFhmdi79ZUwnx7I3fTWKDUQ9ytArWzAbRdL_XwulkWYzlNHahHDO0s3ysxKurmdoyk_wm1cVYGkgDwBl_AQJXzPZl4" alt="Photosynthesis equation" width="624" height="44">
5. Show with the help of a sketch that plants are the ultimate source of food.
Solution:
<img title="sketch that plants are the ultimate source of food" src="https://lh7-us.googleusercontent.com/F1DpAtv-qWM8C872EOafqmr9Gu_ikIvE9SCUyzfmzX3KxspPMFviqa8mQqfyIW4XqwOkvDFZf68HGiMc7KKn3EveRDXCIDczBHTPXMjaXR3ASjLXraN-AU5wLPOtm8PJY2ND0ZoC77ksq7eKcc4E4iw" alt="sketch that plants are the ultimate source of food" width="546" height="499">
6. Fill in the blanks.
(a) Green plants are called _________________ since they synthesise their own food.
(b) The food synthesised by plants is stored as _________________.
(c) In photosynthesis, solar energy is absorbed by the pigment called ___________.
(d) During photosynthesis, plants take in ______________________ and release __________________ gas.
Solution:
(a) Green plants are called autotrophs since they synthesise their food.
(b) The food synthesised by plants is stored as starch.
(c) In photosynthesis, solar energy is absorbed by the pigment called chlorophyll.
(d) During photosynthesis, plants take in carbon dioxide and release oxygen gas.
7. Name the following.
i) A parasitic plant with a yellow, slender and branched stem.
ii) A plant that is partially autotrophic.
iii) The pores through which leaves exchange gases.
Solution:
i) Cuscuta
ii) Pitcher plant
iii) Stomata
8. Tick the correct answer.
(a) Cuscuta is an example of:
(i) autotroph
(ii) parasite
(iii) saprotroph (iv) host
(b) The plant which traps and feeds on insects is:
(i) Cuscuta
(ii) China rose
(iii) pitcher plant
(iv) rose
Solution:
(a) (ii) Parasite
(b) (iii) pitcher plant
9. Match the items given in Column I with those in Column II.
<div dir="ltr" align="left">
<table><colgroup><col width="279"><col width="309"></colgroup>
<thead>
<tr>
<th scope="col">
Column-I
</th>
<th scope="col">
Column-II
</th>
</tr>
<tr>
<th scope="col">
Chlorophyll
</th>
<th scope="col">
Rhizobium
</th>
</tr>
</thead>
<tbody>
<tr>
<td>
Nitrogen
</td>
<td>
Heterotrophs
</td>
</tr>
<tr>
<td>
Cuscuta
</td>
<td>
Pitcher plant
</td>
</tr>
<tr>
<td>
Animals
</td>
<td>
Leaf
</td>
</tr>
<tr>
<td>
Insects
</td>
<td>
Parasite
</td>
</tr>
</tbody>
</table>
</div>
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="277"><col width="311"></colgroup>
<tbody>
<tr>
<td>
Column-I
</td>
<td>
Column-II
</td>
</tr>
<tr>
<td>
Chlorophyll
</td>
<td>
Leaf
</td>
</tr>
<tr>
<td>
Nitrogen
</td>
<td>
Rhizobium
</td>
</tr>
<tr>
<td>
Cuscuta
</td>
<td>
Parasite
</td>
</tr>
<tr>
<td>
Animals
</td>
<td>
Heterotrophs
</td>
</tr>
<tr>
<td>
Insects
</td>
<td>
Pitcher plant
</td>
</tr>
</tbody>
</table>
</div>
10. Mark &lsquo;T&rsquo; if the statement is true and &lsquo;F&rsquo; if it is false.
(i) Carbon dioxide is released during photosynthesis. (T/F)
(ii) Plants which synthesise their food are called saprotrophs. (T/F)
(iii) The product of photosynthesis is not a protein. (T/F)
(iv) Solar energy is converted into chemical energy during photosynthesis. (T/F)
Solution:
<ol>
<li dir="ltr" style="font-weight: bold;" aria-level="1">
False
</li>
<li dir="ltr" aria-level="1">
False
</li>
<li dir="ltr" aria-level="1">
True
</li>
<li dir="ltr" aria-level="1">
True
</li>
</ol>
11. Choose the correct option from the following:
Which part of the plant takes in carbon dioxide from the air for photosynthesis?
(i) Root hair (ii) Stomata (iii) Leaf veins (iv) Petals
Solution:
The answer is (ii) Stomata
12. Choose the correct option from the following:
Plants take carbon dioxide from the atmosphere mainly through their:
(i) roots (ii) stem (iii) flowers (iv) leaves
Solution:
The answer is (iv) leaves
13. Why do farmers grow many fruits and vegetable crops inside large greenhouses? What are the advantages to the farmers?
Solution:
Fruits and vegetable crops are grown in large greenhouses because it protects crops from external climatic conditions and provides suitable temperature for the growth of crops.
Advantages to farmers while growing fruits and vegetable crops inside greenhouses are
<ul>
<li dir="ltr" aria-level="1">
It protects crops from diseases and adverse climatic conditions.
</li>
<li dir="ltr" aria-level="1">
It protects crops from wind and rodents
</li>
</ul>

Download Class 7 Science Chapter 1 Nutrition in Plants - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 1 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 1 Nutrition in Plants - Free PDF Download | ORCHIDS

Embark on a journey of knowledge with the NCERT Solutions for Class 7 Science Chapter 2 - Nutrition in Animals. This chapter opens up a world of new and fundamental topics that play a crucial role in shaping your academic journey.

Embark on a journey of knowledge with the NCERT Solutions for Class 7 Science Chapter 2 - Nutrition in Animals. This chapter opens up a world of new and fundamental topics that play a crucial role in shaping your academic journey.
Our meticulously crafted NCERT Solutions for Class 7 Science Chapter 2 are readily available in PDF format. You can effortlessly download them from our website, providing you with convenient access to valuable study material. These solutions serve as an essential resource to help you comprehend the intricate concepts of nutrition.
By delving into these comprehensive NCERT Solutions, you gain a deeper insight into the subject matter. The step-by-step explanations provided are tailored to enhance your understanding. In the pursuit of academic excellence, it is imperative to grasp these concepts thoroughly and perform well in your examinations.
The provided NCERT Solutions are meticulously structured to assist students in comprehending and practicing questions pertaining to animal nutrition. Additionally, this chapter serves as an introduction to vital subjects like nutrition and digestion in humans, animals, and simpler organisms. It delves into the nutrition process, the digestive system, and more. The NCERT Solutions for Class 7 Science, specifically tailored for "Nutrition in Animals," encompass various examples and solved exercises that serve as valuable resources for exam preparation. These materials offer students a platform to enhance their understanding of this subject. For an extensive collection of NCERT Solutions and educational resources, including Class 7 Science materials, explore Orchids. Our user-friendly platform provides comprehensive support to students. Download our app to access a treasure trove of educational content and embark on an enriching learning journey.
In Chapter 2 Nutrition in Animals, the following key topics are explored:
<ul>
<li dir="ltr" aria-level="1">
An Introduction to Nutrition
</li>
<li dir="ltr" aria-level="1">
Various Methods of Food Ingestion
</li>
<li dir="ltr" aria-level="1">
The Human Digestive System
</li>
<li dir="ltr" aria-level="1">
Examination of the Mouth and Buccal Cavity
</li>
<li dir="ltr" aria-level="1">
Functions of Salivary Glands
</li>
<li dir="ltr" aria-level="1">
Understanding the Esophagus
</li>
<li dir="ltr" aria-level="1">
Insights into the Stomach
</li>
<li dir="ltr" aria-level="1">
Exploration of the Small and Large Intestine
</li>
<li dir="ltr" aria-level="1">
Digestion Processes in Herbivore Animals
</li>
<li dir="ltr" aria-level="1">
Ingestion and Digestion in Amoeba
</li>
</ul>
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 2 &ndash; Nutrition in Animals Exercise Questions</h3>
1. Fill in the blanks:
(a) The main steps of nutrition in humans are _________, __________, __________, _________ and __________.
(b) The largest gland in the human body is __________.
(c) The stomach releases hydrochloric acid and ___________ juices which act on food.
(d) The inner wall of the small intestine has many finger-like outgrowths called _________.
(e) Amoeba digests its food in the ____________ .
Solution:
(a) The main steps of nutrition in humans are ingestion, digestion, absorption, assimilation and egestion.
(b) The largest gland in the human body is liver.
(c) The stomach releases hydrochloric acid and digestive juices which act on food.
(d) The inner wall of the small intestine has many finger-like outgrowths called villi.
(e) Amoeba digests its food in the food vacuole.
2.Mark &lsquo;T&rsquo; if the statement is true and &lsquo;F&rsquo; if it is false:
(a) Digestion of starch starts in the stomach. (T/F)
(b) The tongue helps in mixing food with saliva. (T/F)
(c) The gall bladder temporarily stores bile. (T/F)
(d) The ruminants bring back swallowed grass into their mouth and chew it for some time. (T/F)
Solution:
a) F
b) T
c) T
d) T
3. Tick (✓) mark the correct answer in each of the following:
(a) Fat is completely digested in the
(i) stomach (ii) mouth (iii) small intestine (iv) large intestine
(b) Water from the undigested food is absorbed mainly in the
(i) stomach (ii) food pipe (iii) small intestine (iv) large intestine
Solution:
a) (iii) small intestine
b) (iv) large intestine
4. Match the items of Column I with those given in Column II:
<div dir="ltr" align="left">
<table><colgroup><col width="259"><col width="330"></colgroup>
<tbody>
<tr>
<td>
Column- I
</td>
<td>
Column- II
</td>
</tr>
<tr>
<td>
Food components
</td>
<td>
Product(s) of digestion
</td>
</tr>
<tr>
<td>
Carbohydrates
</td>
<td>
Fatty acids and glycerol
</td>
</tr>
<tr>
<td>
Proteins
</td>
<td>
Sugar
</td>
</tr>
<tr>
<td>
Fats
</td>
<td>
Amino acids
</td>
</tr>
</tbody>
</table>
</div>
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="259"><col width="329"></colgroup>
<tbody>
<tr>
<td>
Column- I
</td>
<td>
Column- II
</td>
</tr>
<tr>
<td>
Food components
</td>
<td>
Product(s) of digestion
</td>
</tr>
<tr>
<td>
Carbohydrates
</td>
<td>
Sugar
</td>
</tr>
<tr>
<td>
Proteins
</td>
<td>
Amino acids
</td>
</tr>
<tr>
<td>
Fats
</td>
<td>
Fatty acids and glycerol
</td>
</tr>
</tbody>
</table>
</div>
5. What are villi? What is their location and function?
Solution:
Villi are finger-like projections or outgrowth. They are present in the small intestine of our digestive system. The villi increase the surface area for absorption of the digested food.
6. Where is the bile produced? Which component of the food does it help to digest?
Solution:
Bile juice is produced in the liver, and it helps in the digestion of fats by breaking large fat globules into smaller ones.
7. Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.
Solution:
Cellulose is the carbohydrate that can be digested by ruminants but not by humans because humans lack cellulase enzyme required to digest the cellulose.
8. Why do we get instant energy from glucose?
Solution:
Glucose is a simple sugar which is easily absorbed into the blood whereas other carbohydrates are first broken down into glucose and then absorbed; hence, glucose gives instant energy.
9. Which part of the digestive canal is involved in:
(i) absorption of food ________________.
(ii) chewing of food ________________.
(iii) killing of bacteria ________________.
(iv) complete digestion of food ________________.
(v) formation of faeces ________________.
Solution:
i) Small intestine
ii) Buccal cavity
iii)Stomach
iv) Small intestine
v) Large Intestine
10. Write one similarity and one difference between nutrition in amoeba and human beings.
Solution:
Similarity: Both amoeba and human beings follow the holozoic type of nutrition.
Difference:
Humans intake food through buccal cavity. In amoeba food is ingested through pseudopodia.
11. Match the items of Column I with suitable items in Column II
<div dir="ltr" align="left">
<table><colgroup><col width="221"><col width="367"></colgroup>
<tbody>
<tr>
<td>
Column-I
</td>
<td>
Column-II
</td>
</tr>
<tr>
<td>
a) Salivary gland
</td>
<td>
(i) Bile juice secretion
</td>
</tr>
<tr>
<td>
b) Stomach
</td>
<td>
(ii) Storage of undigested food
</td>
</tr>
<tr>
<td>
c) Liver
</td>
<td>
(iii) Saliva secretion
</td>
</tr>
<tr>
<td>
d) Rectum
</td>
<td>
(iv) Acid release
</td>
</tr>
<tr>
<td>
e) Small intestine
</td>
<td>
(v) Digestion is completed
</td>
</tr>
<tr>
<td>
f) Large intestine
</td>
<td>
(vi) Absorption of water
</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>
(vii) Release of faeces
</td>
</tr>
</tbody>
</table>
</div>
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="223"><col width="365"></colgroup>
<tbody>
<tr>
<td>
Column-I
</td>
<td>
Column-II
</td>
</tr>
<tr>
<td>
a) Salivary gland
</td>
<td>
(iii) Saliva secretion
</td>
</tr>
<tr>
<td>
b) Stomach
</td>
<td>
(iv) Acid release
</td>
</tr>
<tr>
<td>
c) Liver
</td>
<td>
(i) Bile juice secretion
</td>
</tr>
<tr>
<td>
d) Rectum
</td>
<td>
(ii) Storage of undigested food
</td>
</tr>
<tr>
<td>
e) Small intestine
</td>
<td>
(v) Digestion is completed
</td>
</tr>
<tr>
<td>
f) Large intestine
</td>
<td>
(vi) Absorption of water
</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
</tbody>
</table>
</div>
12. Label Fig. 2.11 of the digestive system.
<img title="Human digestive system" src="https://lh7-us.googleusercontent.com/vpgkH6tZrnSW0kFMXueAV_jzyvZ2h02LZi7zBC7xf43Eg4ihdqhacTGps1tHuYFEg8sjgW_J0Ng3qpVhqCfbld6XtK07qOjqr4IDBgiZeMw2iY1pt4YAqYtARB0oZhcPZE_dR2AytQjyRcP8_mdplC8" alt="Human digestive system" width="408" height="509">
Solution:
<img title="Human digestive system" src="https://lh7-us.googleusercontent.com/vigq3_683xLTwuMLd1qI7GR5cJ2sMyQ_s9gohYTjOLqCqxvdr-Z_9oXNUpiYMtwGowTp4Z5X3_TeRf-quTEpTVvHxdRck1G-mFinIBMo2ajEZQ1gj1xItl_pD7jCycE_WazPt8hHYJiuBd0EsHVlmF0" alt="Human digestive system" width="624" height="484">
13. Can we survive only on raw, leafy vegetables/grass? Discuss.
Solution:
No, we cannot survive only on raw, leafy vegetables because they mainly consist of Cellulose which cannot be digested by us due to lack of cellulose-digesting enzyme in our body.

Download Class 7 Science Chapter 2 Nutrition in Animals - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 2 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 2 Nutrition in Animals - Free PDF Download | ORCHIDS

In the realm of Class 7 Science, Chapter 3 - Fibre to Fabric, our expert professionals have meticulously crafted NCERT Solutions to bolster your studies. At Orchids’, we offer free access to these NCERT Solutions for Class 7 Science in a convenient PDF format, ensuring that students can readily avail themselves of this valuable resource.

In the realm of Class 7 Science, Chapter 3 - Fibre to Fabric, our expert professionals have meticulously crafted NCERT Solutions to bolster your studies. At Orchids&rsquo;, we offer free access to these NCERT Solutions for Class 7 Science in a convenient PDF format, ensuring that students can readily avail themselves of this valuable resource.
Whether you prefer practicing these questions online or downloading the PDF files for your Class 7 Fibre to Fabric worksheets, our aim is to provide flexibility and accessibility.
These NCERT Solutions for Class 7 Science Chapter 3 are designed to empower you with a comprehensive understanding. They encompass various question types, including objective, short, and long-format questions, tailored to meet the requirements of your exams. By utilizing these solutions, you can enhance your knowledge and build the confidence necessary for exam preparation.
Students can effectively employ NCERT Solutions for Class 7 as handy references to facilitate the comprehension of both simple and intricate topics in Class 7 Science.
Fibres &ndash; These are fine, elongated filaments or continuous threads derived from animals and plants. There are two primary types of fibres: plant fibre and animal fibre.
Silk &ndash; Among the typical fibres procured from animals, silk is a notable example. It is sourced from silkworms. Conversely, wool, another animal fibre, is obtained from animals like goats, sheep, and yaks.
Animal Fibre &ndash; Animal fibres encompass materials such as the hair of alpacas, llamas, and camels, which are processed to yield wool. In India, sheep are primarily raised for wool production. The process involves shearing the hair from the sheep's body, followed by cleaning, drying, sorting, coloring, spinning, and weaving to obtain wool.
Sources of Wool &ndash; Wool is derived from various animals, including yaks (found in Ladakh and Tibet), Angora goats, sheep, goats, camels, and alpacas.
This represents a concise introduction to NCERT Solutions for Class 7 Science, Chapter 3. At Orchids, we offer solutions for all classes in a straightforward and easily understandable manner. Our platform encompasses solutions for various classes and chapters, allowing students to access resources related to Class 7 Science and other subjects. For an extensive collection of NCERT Solutions, study materials spanning all subjects and classes, explore Orchids. You can download our app to access a wealth of information and enjoy a superior learning experience..
&nbsp;
Key Topics Addressed in Class 7 Science NCERT Solutions Chapter 3, "Fibre To Fabric" include:
<ul>
<li dir="ltr" aria-level="1">
Fibres
</li>
<li dir="ltr" aria-level="1">
Various Types of Fibres
</li>
<li dir="ltr" aria-level="1">
The Characteristics and Utility of Silk
</li>
<li dir="ltr" aria-level="1">
Wool and Its Significance
</li>
<li dir="ltr" aria-level="1">
Exploring Sources of Wool
</li>
<li dir="ltr" aria-level="1">
The Wool Processing Procedure
</li>
</ul>
 
<h3 dir="ltr">NCERT Class 7 Science for Chapter 3 &ndash; Fibre to Fabric Exercise Questions</h3>
1. You must be familiar with the following nursery rhymes:
(i) &lsquo;Baa, baa, black sheep, have you any wool.&rsquo;
(ii) &lsquo;Mary had a little lamb, whose fleece was white as snow.&rsquo;
Answer the following.
(a) Which parts of the black sheep have wool?
(b) What is meant by the white fleece of the lamb?
Solution:
a) Wool is obtained from the hairy fibres of the sheep.
b) White fleece of the lamb refers to the white colour of their fur.
2. The silkworm is (a) a caterpillar, (b) a larva.
Choose the correct option.
(i) a (ii) b (iii) both a and b (iv) neither a nor b.
Solution:
(iii) both a and b
3. Which of the following does not yield wool?
(i) Yak (ii) Camel (iii) Goat (iv) Woolly dog
Solution:
The answer is (iv) Woolly dog
4. What is meant by the following terms? (i) Rearing (ii) Shearing (iii) Sericulture
Solution:
i) Raising of domestic animals like sheep, goats, yak, cows and buffaloes for commercial purposes, such as for milk and fur is known as rearing.
ii) Shearing is a process of removal of animal hair by using machines similar to those used by barbers.
ii) Rearing of silkworms to get silk is known as Sericulture.
5. Given below is a sequence of steps in the processing of wool. Which are the missing steps? Add them.
Shearing, __________, sorting, __________, __________, _________.
Solution:
Shearing, Scouring, sorting, picking of burrs, dying of fibres, making of yarn.
6. Make sketches of the two stages in the life history of the silk moth which are directly related to the production of silk.
Solution:
<img title="Life history of silk moth" src="https://lh7-us.googleusercontent.com/o5cs5-Nwt9ypWPAQozg4Is9JSyRA8XnoA7T9wq4wKp7lMXQdU_qDkvOqZRt2rc5YZXb5HPgOla29ZTC_VN6LJHqS2bedXga0FuCaYLUSejq6CUTbv-AnzBO2s-MO7OIGELvm5VXZglig3iMNnhHqLzY" alt="Life history of silk moth" width="624" height="291">
7. Out of the following, which are the two terms related to silk production?
Sericulture, floriculture, moriculture, apiculture and silviculture.
Hints: (i) Silk production involves the cultivation of mulberry leaves and rearing silkworms. (ii) Scientific name of mulberry is Morus alba.
Solution:
Sericulture and moriculture
8. Match the words of Column I with those given in Column II.
<div dir="ltr" align="left">
<table><colgroup><col width="251"><col width="338"></colgroup>
<tbody>
<tr>
<td>
Column-I
</td>
<td>
Column-I
</td>
</tr>
<tr>
<td>
1. Scouring
</td>
<td>
(a) Yields silk fibres
</td>
</tr>
<tr>
<td>
2. Mulberry leaves
</td>
<td>
(b) Wool-yielding animal
</td>
</tr>
<tr>
<td>
3. Yak
</td>
<td>
(c) Food of silkworm
</td>
</tr>
<tr>
<td>
4. Cocoon
</td>
<td>
(d) Reeling
</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>
(e) Cleaning sheared skin
</td>
</tr>
</tbody>
</table>
</div>
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="251"><col width="337"></colgroup>
<tbody>
<tr>
<td>
Column-I
</td>
<td>
Column-I
</td>
</tr>
<tr>
<td>
1. Scouring
</td>
<td>
(e) Cleaning sheared skin
</td>
</tr>
<tr>
<td>
2. Mulberry leaves
</td>
<td>
(c) Food of silkworm
</td>
</tr>
<tr>
<td>
3. Yak
</td>
<td>
(b) Wool-yielding animal
</td>
</tr>
<tr>
<td>
4. Cocoon
</td>
<td>
(a) Yields silk fibres
</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
</tbody>
</table>
</div>
9. Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words.
Down
(D) 1: Thorough washing
2: Animal fibre
3: Animal fibre
Across
(A) 1: Keeps warm
2: Its leaves are eaten by silkworms
3: Hatches from the egg of a moth
<img title="Puzzles of fibres and fabric" src="https://lh7-us.googleusercontent.com/usPAkUWPxNRLlDWPdrCH2Dpg37ksO94pMT-T9UwvdAa-nPKvcjH8pwhrlu4OHcOXU10WYtwSmhxiHxP-DlHtfMQozG-uWn8oYFYPbZR220Q4ahP--dx5rlenGtxnkH8GOb_ArNH6-32_vedL62v-CKs" alt="Puzzles of fibres and fabric" width="544" height="350">
Solution:
Down:
1D. Scour
2D. Silk
3D. Fibre
Across
1A. Wool
2A. Mulberry
3A. Caterpillar
<img title="Puzzles of fibres and fabric" src="https://lh7-us.googleusercontent.com/y7c2oDMN3seLRoyVCkZMkpZQoBNVcpbtF7Bj_KJHbnv934P_F6MiNr3o-O0FDN_e1y9FjDdcZaLSuCpJbpKn2aOMWchCHJ4kPN6Ehg3DdIq-letc86yOlrXBol6SnQLD5wupqvgqnPvZueMqhuKf-18" alt="Puzzles of fibres and fabric" width="624" height="399">

Download Class 7 Science Chapter 3 Fibre to Fabric - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 3 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 3 Fibre to Fabric - Free PDF Download | ORCHIDS

We offer NCERT Solutions for Class 7 Science Chapter 4 in PDF format, catering to dedicated learners who seek high-quality study materials. These solutions are meticulously prepared by seasoned educators with years of experience in the teaching profession.

We offer NCERT Solutions for Class 7 Science Chapter 4 in PDF format, catering to dedicated learners who seek high-quality study materials. These solutions are meticulously prepared by seasoned educators with years of experience in the teaching profession.
Chapter 4, titled "Heat," is a pivotal part of Class 7 Science, and it plays a crucial role in helping students excel in the increasingly competitive academic environment. By downloading the Class 7 Heat Chapter notes from Vedantu, students significantly enhance their chances of academic success.
In addition to the NCERT Solutions for Class 7 Science, our platform provides a comprehensive array of supplementary materials, including detailed notes, sample papers, and revision resources. These valuable tools serve as indispensable aids to students aiming for exceptional results in their academic journey.
This chapter is centered around exploring concepts related to heat and the measurement of heat. It delves into questions that help distinguish clinical and laboratory thermometers, differentiate between heat and temperature, and identify conductors and insulators along with relevant examples. The chapter also incorporates fill-in-the-blank questions, challenging students to provide the correct terms to complete sentences and enhance their understanding. These multifaceted questions serve to simplify complex topics. For a more detailed comprehension of these concepts, students can turn to NCERT Solutions for Class 7.
Key topics covered in NCERT Solutions for Class 7, Chapter 4 - Heat include:
<ul>
<li dir="ltr" aria-level="1">
Understanding "Hot" and "Cold"
</li>
<li dir="ltr" aria-level="1">
Methods for Measuring Temperature
</li>
<li dir="ltr" aria-level="1">
Examination of Thermometers
</li>
<li dir="ltr" aria-level="1">
Mechanisms of Heat Transfer
</li>
<li dir="ltr" aria-level="1">
The Influence of Clothing in Various Climatic Conditions
</li>
</ul>
Students can effectively utilize NCERT Solutions for Class 7 Science, Chapter 4 - Heat, as a valuable reference to grasp these concepts and more. Orchids, a prominent educational platform, offers an array of academic resources to facilitate learning. For in-depth insights into these topics and other educational content, continue to explore our resources. To access Orchids' NCERT Solutions, register on our platform or download our app for engaging and informative content.
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 4 &ndash; Heat Exercise Questions</h3>
1. State similarities and differences between the laboratory thermometer and the clinical thermometer.
Solution:
Similarities
<ul>
<li dir="ltr" aria-level="1">
Both are made of glass and consist of a long narrow glass tube
</li>
<li dir="ltr" aria-level="1">
At one end both of them have a bulb
</li>
<li dir="ltr" aria-level="1">
Bulbs of both the thermometers consist of mercury
</li>
<li dir="ltr" aria-level="1">
Celsius scale is present in both the thermometers
</li>
</ul>
Differences
<div dir="ltr" align="left">
<table><colgroup><col width="321"><col width="267"></colgroup>
<tbody>
<tr>
<td>
Clinical Thermometer
</td>
<td>
Laboratory thermometer
</td>
</tr>
<tr>
<td>
Temperature range is 35 to 42 0 c
</td>
<td>
Temperature range is -10 to 110 0 c
</td>
</tr>
<tr>
<td>
Used to measure human body temperature
</td>
<td>
Used to measure temperature in the laboratory
</td>
</tr>
<tr>
<td>
It has kink which prevents immediate backflow of mercury
</td>
<td>
It does not have a kink
</td>
</tr>
</tbody>
</table>
</div>
2. Give two examples each of conductors and insulators of heat.
Solution:
Conductors: Iron and copper
Insulators: Plastic and wood
3. Fill in the blanks :
(a) The hotness of an object is determined by its __________.
(b) Temperature of boiling water cannot be measured by a _____________ thermometer.
(c) Temperature is measured in degree ______________.
(d) No medium is required for transfer of heat by the process of __________.
(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of ______________.
(f ) Clothes of ______________ colours absorb heat better than clothes of light colours.
Solution:
(a) The hotness of an object is determined by its temperature.
(b) Temperature of boiling water cannot be measured by a clinical thermometer.
(c) Temperature is measured in degree Celcius.
(d) No medium is required for transfer of heat by the process of radiation.
(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of conduction.
(f ) Clothes of dark colours absorb heat better than clothes of light colours.
4. Match the following:&nbsp;
<div dir="ltr" align="left">
<table><colgroup><col width="459"><col width="130"></colgroup>
<tbody>
<tr>
<td>
Column-I
</td>
<td>
Column-II
</td>
</tr>
<tr>
<td>
(i) Land breeze blows during
</td>
<td>
(a) summer
</td>
</tr>
<tr>
<td>
(ii) Sea breeze blows during
</td>
<td>
(b) winter
</td>
</tr>
<tr>
<td>
(iii) Dark coloured clothes are preferred during
</td>
<td>
(c) day
</td>
</tr>
<tr>
<td>
(iv) Light coloured clothes are preferred during
</td>
<td>
(d) night
</td>
</tr>
</tbody>
</table>
</div>
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="455"><col width="134"></colgroup>
<tbody>
<tr>
<td>
Column-I
</td>
<td>
Column-II
</td>
</tr>
<tr>
<td>
(i) The land breeze blows during
</td>
<td>
(d) night
</td>
</tr>
<tr>
<td>
(ii) The sea breeze blows during
</td>
<td>
(c) day
</td>
</tr>
<tr>
<td>
(iii) Dark coloured clothes are preferred during
</td>
<td>
(b) winter
</td>
</tr>
<tr>
<td>
(iv) Light coloured clothes are preferred during
</td>
<td>
(a) summer
</td>
</tr>
</tbody>
</table>
</div>
5. Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.
Solution:
More layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing because air gets trapped in between the layers. As air is a bad conductor of heat it does not allow the heat to escape from the body.
6. Look at Fig. 4.13. Mark where the heat is being transferred by conduction, by convection and by radiation.
<img title="conduction" src="https://lh7-us.googleusercontent.com/2kZuTkXx_m7dgchdbgZDpNDovs1BKzbStZYgK5rdhSrhFoB-r_o4R3oXCDVIlfoudaD5d_b55Pdy-HjoIsirQ3UHTi_rKNEtrWP3gQGCC0Dxvwm-Maar9ltDDFtEzIJGzQK_7YkAjnjZyYz-_CyvEaU" alt="conduction" width="473" height="424">
Solution:
<img title="conduction radiation and convection" src="https://lh7-us.googleusercontent.com/yJMMpl9ZqoJmyJ-MFxQy7qEPdfWhnxoXbzFwMJGV37wIyBc2ISbLA2jvag6hd_d0nuM4Kj9y0HhQvklhwzyDcjHsng0-AJUFcjrdgl0lS6ptqaXGJE8FWf12QvKS7UUFd8fnc5PR5G-WeohIdeS2N8U" alt="conduction radiation and convection" width="624" height="292">
7. In places of hot climate it is advised that the outer walls of houses be painted white. Explain.
Solution:
In places of hot climate, it is advised that the outer walls of houses be painted white because white colour reflects back most of the heat that is incident on it, as white is a poor absorber of heat. This helps in keeping the house cool.
8. One litre of water at 30&deg;C is mixed with one litre of water at 50&deg;C. The temperature of the mixture will be
(a) 80&deg;C (b) more than 50&deg;C but less than 80&deg;C (c) 20&deg;C (d) between 30&deg;C and 50&deg;C
Solution:
The temperature of the mixture will be between 30&deg;C and 50&deg;C because hot water loses heat and simultaneously cold water gains heat. This keeps the temperature in between 30&deg;C and 50&deg;C.
9. An iron ball at 40&deg;C is dropped in a mug containing water at 40&deg;C. The heat will
(a) flow from the iron ball to water.
(b) not flow from the iron ball to water or from water to the iron ball.
(c) flow from water to the iron ball.
(d) increase the temperature of both.
Solution:
Answer is (b) not flow from the iron ball to water or from water to the iron ball because both of them have the same temperature of 40&deg;C.
10. A wooden spoon is dipped in a cup of ice cream. Its other end
(a) becomes cold by the process of conduction.
(b) becomes cold by the process of convection.
(c) becomes cold by the process of radiation.
(d) does not become cold.
Solution:
The answer is (d) does not become cold because wood is a bad conductor of heat.
11. Stainless steel pans are usually provided with copper bottoms. The reason for this could be that
(a) copper bottom makes the pan more durable.
(b) such pans appear colourful.
(c) copper is a better conductor of heat than stainless steel.
(d) copper is easier to clean than stainless steel.
Solution:
The answer is (c) copper is a better conductor of heat than stainless steel.
&nbsp;

Download Class 7 Science Chapter 4 Heat - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 4 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 4 Heat - Free PDF Download | ORCHIDS

The significance of NCERT Solutions for Class 7 Science Chapter 5, "Acids, Bases, and Salts," cannot be overstated. This chapter plays a pivotal role in the field of science education, and its implications extend beyond the classroom. It exerts a profound impact on students' academic progression, particularly in the context of CBSE Class 7 examinations. The NCERT Solutions presented here are meticulously crafted to provide a comprehensive understanding of the subject matter. They prove to be invaluable, especially for students who may be grappling with the challenge of retaining the intricate concepts related to Acids, Bases, and Salts over an extended period of time. These solutions, directly aligned with the NCERT curriculum and textbook, serve as an essential tool for effective learning and skill development in this domain. With the knowledge and proficiency gained from these NCERT Solutions, students are better equipped to excel in their studies, both in the present and as they progress through their educational journey.

The significance of NCERT Solutions for Class 7 Science Chapter 5, "Acids, Bases, and Salts," cannot be overstated. This chapter plays a pivotal role in the field of science education, and its implications extend beyond the classroom. It exerts a profound impact on students' academic progression, particularly in the context of CBSE Class 7 examinations. The NCERT Solutions presented here are meticulously crafted to provide a comprehensive understanding of the subject matter. They prove to be invaluable, especially for students who may be grappling with the challenge of retaining the intricate concepts related to Acids, Bases, and Salts over an extended period of time. These solutions, directly aligned with the NCERT curriculum and textbook, serve as an essential tool for effective learning and skill development in this domain. With the knowledge and proficiency gained from these NCERT Solutions, students are better equipped to excel in their studies, both in the present and as they progress through their educational journey.
&nbsp;
The combination of acids and bases leads to the formation of salts, which can exhibit acidic, basic, or neutral properties. This chemical process is known as neutralization and holds significant importance, especially in the context of examinations. To facilitate a clearer understanding of acids, bases, and salts, it is beneficial to create a comparative table differentiating them.
Acids, bases, and salts are substances that play common roles in our daily lives. Understanding their properties is essential to harness their benefits and mitigate potential risks. From an examination perspective, the concept of neutralization and its practical applications are vital. The Class 7 NCERT Solutions for Science comprehensively cover all the topics within this chapter. You can readily download the provided PDF for your reference, and if needed, you may even consider printing it for convenient access during your exam preparation.
Orchids, renowned for its educational excellence, offers a platform that provides a wealth of resources, including notes and question papers, spanning various subjects such as Mathematics, Biology, Chemistry, and catering to a range of competitive exams. Engage in a productive learning experience with us. For more insights into NCERT Solutions and valuable preparation tips, stay tuned. To explore Orchids' NCERT Solutions, you can register with our platform or download our app to access engaging and informative content.
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 5 &ndash; Acids, Bases and Salts Exercise Questions</h3>
1. State differences between acids and bases.
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="276"><col width="313"></colgroup>
<tbody>
<tr>
<td>
Acids
</td>
<td>
Bases
</td>
</tr>
<tr>
<td>
Acids are sour in taste
</td>
<td>
Bases are bitter in taste
</td>
</tr>
<tr>
<td>
Acids turn blue litmus paper into red color
</td>
<td>
The base does not change the colour of blue litmus paper
</td>
</tr>
<tr>
<td>
Acids does not change the colour of the red litmus
</td>
<td>
Bases turn red litmus paper to blue color
</td>
</tr>
<tr>
<td>
Acids do not change the colour of turmeric
</td>
<td>
Bases turn turmeric to red
</td>
</tr>
</tbody>
</table>
</div>
2. Ammonia is found in many household products, such as window cleaners. It turns red litmus blue. What is its nature?
Solution:
The answer is it is basic in nature.
3. Name the source from which litmus solution is obtained. What is the use of this solution?
Solution:
Litmus solution is extracted from lichens. Litmus solution is used as an indicator to find acidic and basic nature of a solution.
4. Is the distilled water acidic/basic/neutral? How would you verify it?
Solution:
Distilled water is neutral in nature, and this can be tested by using red and blue litmus paper. In either of the cases, colour remains unchanged.
5. Describe the process of neutralisation with the help of an example.
Solution:
Neutralisation is a reaction between an acid and a base. Here, both acids and bases get neutralised. For example, when sodium hydroxide (NaOH) is added to hydrochloric acid (HCl), sodium chloride (NaCl) and water (H2O) are obtained.
NaOH + HCl &rarr; NaCl + H2O + Heat
6. Mark &lsquo;T&rsquo; if the statement is true and &lsquo;F&rsquo; if it is false.
(i) Nitric acid turns red litmus blue. (T/F)
(ii) Sodium hydroxide turns blue litmus red. (T/F)
(iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F)
(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)
(v) Tooth decay is caused by the presence of a base. (T/F)
Solution:
i) False
ii) False
iii) True
iv) True
v) False
7. Dorji has a few bottles of soft drinks in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants an acidic drink, another wants a basic drink, and the third one wants a neutral drink. How will Dorji decide which drink is to be served to whom?
Solution:
Dorji can taste a few drops out of soft drinks bottles; the acidic solution is sour in taste, the basic solution is bitter in taste, and the neutral solution has no taste. Along with tasting, Dorji can use litmus paper to test the nature of the soft drinks. He should use blue litmus paper to test the acidic solution. Dorji has to put a drop of solution on blue litmus. If it turns red, then the solution will be acidic in nature.
Similarly, he can use red litmus paper to test the basic solution. He has to put a drop of solution on red litmus. If it turns blue, then the solution will be basic in nature.
8. Explain why
(a) An antacid tablet is taken when you suffer from acidity
(b) Calamine solution is applied on the skin when an ant bites.
(c) Factory waste is neutralised before disposing it into the water bodies.
Solution:
<ol>
<li dir="ltr" style="font-weight: bold;" aria-level="1">
The antacid tablet contains base-like milk of magnesia, which neutralises the acid produced in the stomach. Hence, it is used while suffering from acidity.
</li>
<li dir="ltr" aria-level="1">
When ant bites, it injects formic acid inside the skin. Calamine consists of Zinc carbonate which is basic in nature. Hence, calamine neutralises the effect of formic acid to bring relief for the affected person.
</li>
<li dir="ltr" aria-level="1">
Factory wastes are acidic in nature which may cause harm to aquatic life. Hence, they are neutralised by using a base before disposing it into the water bodies.
</li>
</ol>
9. Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide, and the third is a sugar solution. How will you identify them? You have only turmeric indicator.
Solution:
The following steps are taken to test the given liquids:
<ul>
<li dir="ltr" aria-level="1">
Put a drop of provided liquid on the turmeric indicator. The solution that changes the colour of the indicator to red is sodium hydroxide, which is basic in nature.
</li>
<li dir="ltr" aria-level="1">
Now, to make two mixtures, add a drop of sodium hydroxide on the other two liquids individually.
</li>
<li dir="ltr" aria-level="1">
The drop of each combination added to the turmeric indicator one after another.
</li>
<li dir="ltr" aria-level="1">
The mixture that changes the indicator to red colour includes a neutral solution of sugar.
</li>
<li dir="ltr" aria-level="1">
While the mixture contains hydrochloric acid that has been neutralised by the addition of sodium hydroxide, which does not show any colour change in the indicator.
</li>
</ul>
10. Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
Solution:
The above solution may be neutral or basic in nature as both will not change the colour of the blue litmus paper.
11. Consider the following statements:
(a) Both acids and bases change colour of all indicators.
(b) If an indicator gives a colour change with an acid, it does not give a change with a base.
(c) If an indicator changes colour with a base, it does not change colour with an acid.
(d) Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
(i) All four
(ii) a and d
(iii) b, c and d
(iv) only d
Solution:
(iv) Only d is correct
&nbsp;
&nbsp;
&nbsp;

Download Class 7 Science Chapter 5 Acids, Bases and Salts - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 5 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 5 Acids, Bases and Salts - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 6, "Physical and Chemical Changes," are readily available in PDF format. For students aiming to achieve excellent results in their Class 7 examinations, it is imperative to practice the questions provided at the end of each chapter in the NCERT textbook. Notably, some of these questions are frequently asked in school exams, providing a significant advantage to students who have diligently practiced the NCERT Solutions for Class 7.

NCERT Solutions for Class 7 Science Chapter 6, "Physical and Chemical Changes," are readily available in PDF format. For students aiming to achieve excellent results in their Class 7 examinations, it is imperative to practice the questions provided at the end of each chapter in the NCERT textbook. Notably, some of these questions are frequently asked in school exams, providing a significant advantage to students who have diligently practiced the NCERT Solutions for Class 7.
In our daily activities, we often encounter various types of changes, some of which are reversible, while others are irreversible. Examples of these changes include the melting of ice, the transformation of a bud into a flower, the melting of candle wax, and more. Based on the nature of these changes, they are categorized as physical changes and chemical changes.
Physical change: This type of change alters only the physical characteristics of a substance without affecting its internal structure. Examples of physical changes include boiling water, chopping wood, dissolving sugar in water, crumpling paper, and melting an ice cube.
Chemical change: In contrast, a chemical change affects the internal structure of a substance, leading to the formation of a new substance. Examples of chemical changes encompass processes such as digesting food, burning wood, baking a cake, curdling milk, mixing acids, boiling an egg, and the rusting of iron.
For comprehensive insights into these topics, students can refer to the NCERT Solutions for Class 7. These solutions serve as valuable aids during revisions and provide clarity on any doubts that may arise.
Key topics covered in NCERT Solutions for Class 7 Science Chapter 6, "Physical and Chemical Changes," include:
<ul>
<li dir="ltr" aria-level="1">
Exploring Physical Changes
</li>
<li dir="ltr" aria-level="1">
Understanding Chemical Changes
</li>
<li dir="ltr" aria-level="1">
Delving into the Phenomenon of Iron Rusting
</li>
<li dir="ltr" aria-level="1">
The Fascinating World of Crystallization
</li>
</ul>
&nbsp;
Orchids offers NCERT Solutions for all subjects and classes, ranging from Class 1 to 12, following a chapter-wise format to support students in their studies. The solutions presented in this study material are conveyed in simple language and an easy-to-understand methodology, facilitating enhanced learning for students. Orchids' NCERT Solutions for Class 7 Science Chapter 6 provide comprehensive information on the subject, complete with definitions and illustrative examples.
Additionally, these NCERT Solutions are available in PDF format, permitting students to download them directly or utilize them for online practice by visiting the Orchids website.
&nbsp;
Physical and Chemical Changes, encompasses the following topics:
<h3 dir="ltr">NCERT Class 7 Science Chapter 6 &ndash; Physical and Chemical Changes Exercise Questions</h3>
1. Classify the changes involved in the following processes as physical or chemical changes.
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminium to make aluminium foil
(f ) Digestion of food
Solution:
a) Chemical change
b) Physical Change
c) Chemical change
d) Physical Change
e) Physical Change
f) Chemical change
2. State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.
(a) Cutting a log of wood into pieces is a chemical change. (True/False)
(b) Formation of manure from leaves is a physical change. (True/False)
(c) Iron pipes coated with zinc do not get rusted easily. (True/False)
(d) Iron and rust are the same substances. (True/False)
(e) Condensation of steam is not a chemical change. (True/False)
Solution:
a) False
b) False
c) True
d) False
e) True
3. Fill in the blanks in the following statements:
(a) When carbon dioxide is passed through lime water, it turns milky due to the formation of _________.
(b) The chemical name of baking soda is _________.
(c) Two methods by which rusting of iron can be prevented are _________ and _________.
(d) Changes in which only _________ properties of a substance change are called physical changes.
(e) Changes in which new substances are formed are called _________ changes.
Solution:
(a) When carbon dioxide is passed through lime water, it turns milky due to the formation of Calcium carbonate.
(b) The chemical name of baking soda is Sodium hydrogen carbonate.
(c) Two methods by which rusting of iron can be prevented are painting and galvanisation.
(d) Changes in which only physical properties of a substance change are called physical changes.
(e) Changes in which new substances are formed are called chemical changes.
4. When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Solution:
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a carbon dioxide gas. This is a chemical change.
Lemon juice + Baking soda &rarr; Carbon dioxide + other substances
5. When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both chemical and physical changes take place.
Solution:
Candle Burning
Physical change is the melting of the wax.
The chemical change is the burning of gas with the evolution of CO2.
Digestion of Food
Physical change is the breakdown of larger food molecules into simpler ones.
The chemical change is the digestion of food by the action of HCl and enzymes.
6. How would you show that the setting of curd is a chemical change?
Solution:
The setting of curd is a chemical change because curd cannot be turned back to milk. The properties of milk and curd are different.
7. Explain why burning wood and cutting it into small pieces are considered two different types of changes.
Solution:
Cutting wood is a physical change as it does not change the nature of the wood. On the other hand, the burning of wood is a chemical change as wood is converted to charcoal with the liberation of CO2.
8. Describe how crystals of copper sulphate are prepared.
Solution:
Crystals of copper sulphate are prepared using the crystallisation method, which is described as follows:
<ul>
<li dir="ltr" aria-level="1">
Take a cupful of water in a beaker.
</li>
<li dir="ltr" aria-level="1">
Add a few drops of dilute sulphuric acid to this.
</li>
<li dir="ltr" aria-level="1">
Heat the water, and when it starts boiling, add copper sulphate powder while still stirring.
</li>
<li dir="ltr" aria-level="1">
Add the copper sulphate powder till the solution becomes saturated. Filter into a china dish and allow it to cool.
</li>
<li dir="ltr" aria-level="1">
The solution should be kept undisturbed. Slowly, the crystals of copper sulphate separate out.
</li>
</ul>
9. Explain how painting an iron gate prevents it from rusting.
Solution:
Rusting of iron requires contact with water (moisture) and oxygen. By painting an iron gate, we prevent contact between iron, Oxygen and water (moisture); this helps in preventing rusting of iron.
10. Explain why rusting of iron objects is faster in coastal areas than in deserts.
Solution:
Rusting of iron requires contact with water (moisture) and oxygen. In coastal areas, humidity is more in comparison to that in deserts; hence, rusting of iron objects is faster in coastal areas than in deserts.
11. The gas we use in the kitchen is called liquified petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder, it becomes a gas (Change &ndash; A) then it burns (Change &ndash; B). The following statements pertain to these changes. Choose the correct one.
(i) Process &ndash; A is a chemical change.
(ii) Process &ndash; B is a chemical change.
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.
Solution:
The answer is (ii) Process &ndash; B is a chemical change.
12. Anaerobic bacteria digest animal waste and produce biogas (Change &ndash; A). The biogas is then burnt as fuel (Change &ndash; B). The following statements pertain to these changes. Choose the correct one.
(i) Process &ndash; A is a chemical change.
(ii) Process &ndash; B is a chemical change
(iii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.
Solution:
The answer is (iii) Both processes A and B are chemical changes.
&nbsp;

Download Class 7 Science Chapter 6 Physical and Chemical Changes - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 6 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 6 Physical and Chemical Changes - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 7, "Weather, Climate and Adaptations of Animals to Climate," have been meticulously crafted by our team of subject matter experts to facilitate students in their exam preparations. These resources encompass solutions for all the in-text and exercise questions found in the NCERT Class 7 Science textbooks.

NCERT Solutions for Class 7 Science Chapter 7, "Weather, Climate and Adaptations of Animals to Climate," have been meticulously crafted by our team of subject matter experts to facilitate students in their exam preparations. These resources encompass solutions for all the in-text and exercise questions found in the NCERT Class 7 Science textbooks.
Engaging with the questions provided in Class 7 NCERT Solutions for Chapter 7 not only deepens students' understanding of the chapter but also offers a swift revision tool ahead of their final exams. What's more, the accessibility of NCERT Solutions for Class 7 Science PDF is designed to cater to all students. They have the option to conveniently download the PDF files or study online through our website.
&nbsp;
In this chapter, students will gain an understanding of various weather patterns and climates, exploring how living organisms adapt to these distinct environmental conditions. The focus extends to polar regions and tropical rainforests, shedding light on the adaptations of different animals and birds in these diverse climates.
CBSE-affiliated schools are encouraged to adhere to the NCERT curriculum and textbooks, which serve as excellent study materials for Class 7 students. These textbooks comprehensively cover all topics listed in the CBSE syllabus (as of the 2023-2024 update).
To excel in their examinations, students are advised to solve previous years' question papers and sample papers. This practice enables students to assess the question difficulty levels and familiarize themselves with the marking scheme.
Key Topics Covered:
<ul>
<li dir="ltr" aria-level="1">
Weather
</li>
<li dir="ltr" aria-level="1">
Climate
</li>
<li dir="ltr" aria-level="1">
Climate and Adaptations
</li>
</ul>
 
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 7 &ndash; Weather, Climate and Adaptations of Animals to Climate Exercise Questions</h3>
1. Name the elements that determine the weather of a place.
Solution:
Temperature, humidity, rainfall and wind are the elements that determine the weather of a place.
2. When are the maximum and minimum temperatures likely to occur during the day?
Solution:
Maximum temperature occurs during day time, afternoon to be precise, whereas minimum temperature occurs early in the morning.
3. Fill in the blanks.
(i) The average weather taken over a long time is called ___________.
(ii) A place receives very little rainfall, and the temperature is high throughout the year, the climate of that place will be ___________ and ___________ .
(iii) The two regions of the earth with extreme climatic conditions are ___________ and __________.
Solution:
(i) The average weather taken over a long time is called climate.
(ii) A place receives very little rainfall, and the temperature is high throughout the year, the climate of that place will be hot and dry.
(iii) The two regions of the earth with extreme climatic conditions are the polar region and the tropical region.
4. Indicate the type of climate of the following areas.
(a) Jammu and Kashmir: _________________________________
(b) Kerala: ____________________________________________
(c) Rajasthan: __________________________________________
(d) North-east India: _____________________________________
Solution:
(a) Jammu and Kashmir: Moderately hot and wet
(b) Kerala: Hot and wet
(c) Rajasthan: Hot and dry
(d) North-east India: Wet
5. Which of the two changes frequently, weather or climate?
Solution:
Weather changes frequently but not climate.
6. Following are some of the characteristics of animals:
(i) Diets heavy on fruits (ii) White fur
(iii) Need to migrate (iv) Loud voice
(v) Sticky pads on feet (vi) Layer of fat under skin
(vii) Wide and large paws (viii) Bright colours
(ix) Strong tails (x) Long and large beak
For each characteristic, indicate whether it is an adaptation for tropical rainforests or polar regions. Do you think that some of these characteristics can be adapted for both regions?
Solution:
(i) Diets heavy on fruits &ndash; Tropical rainforests
(ii) White fur &ndash; Polar regions
(iii) Need to migrate &ndash; Polar regions
(iv) Loud voice &ndash; Tropical rainforests
(v) Sticky pads on feet &ndash; Tropical rainforests
(vi) The layer of fat under skin &ndash; Polar regions
(vii) Wide and large paws &ndash; Polar regions
(viii) Bright colours &ndash; Tropical rainforests
(ix) Strong tails &ndash; Tropical rainforests
(x) Long and large beak &ndash; Tropical rainforests
7. The tropical rainforest has a large population of animals. Explain why it is so.
Solution:
Hot and humid temperature and continuous rainfall in the tropical rainforest suit the survival of many animals; hence, the tropical rainforest has a large population of animals.
8. Explain, with examples, why we find animals of certain kind living in particular climatic conditions.
Solution:
Animals are adapted to survive in the conditions in which they live. Animals living in a very cold and hot climate must possess special features to protect themselves against extreme cold or heat.
Example: Polar bears have white fur so that they are not easily visible in the snowy white background. It protects them from their predators. It also helps them in catching their prey. To protect them from extreme cold, they have two thick layers of fur. They also have a layer of fat under their skin. In fact, they are so well-insulated that they have to move slowly and often rest to avoid getting overheated.
Similarly, in rainforests, the Red-eyed frog has developed sticky pads on its feet to help it climb the trees on which it lives.
9. How do elephants living in the tropical rainforest adapt themselves?
Solution:
Following are the adaptation of elephants in rainforests:
<ul>
<li dir="ltr" aria-level="1">
They use the trunk as the nose to have a strong sense of smell.
</li>
<li dir="ltr" aria-level="1">
The trunk is also used to pick up food.
</li>
<li dir="ltr" aria-level="1">
They have modified teeth that tear the bark of trees, which is food for elephants
</li>
<li dir="ltr" aria-level="1">
The large ears of elephants help them to hear even very soft sounds.
</li>
<li dir="ltr" aria-level="1">
Ears help elephants to keep cool in the hot and humid climate of the rainforest.
</li>
</ul>
Choose the correct option which answers the following question:
10. A carnivore with stripes on its body moves very fast while catching its prey. It is likely to be found in
(i) polar regions (ii) deserts
(iii) oceans (iv) tropical rainforests
Solution:
The answer is (iv) tropical rainforests.
11. Which features adapt polar bears to live in an extremely cold climate?
(i) A white fur, fat below skin, keen sense of smell.
(ii) Thin skin, large eyes, a white fur.
(iii) A long tail, strong claws, white large paws.
(iv) White body, paws for swimming, gills for respiration.
Solution:
The Answer is (i) A white fur, fat below skin, keen sense of smell.
12. Which option best describes a tropical region?
(i) hot and humid
(ii) moderate temperature, heavy rainfall
(iii) cold and humid
(iv) hot and dry
Solution:
The answer is (i) hot and humid.
&nbsp;

Download Class 7 Science Chapter 7 Weather, Climate and Adaptations of Animals to Climate - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 7 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 7 Weather, Climate and Adaptations of Animals to Climate - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 8, titled "Winds, Storms, and Cyclones," are integral lessons for Class 7 students. Students are encouraged to reference the NCERT textbooks and revision notes, as they serve as valuable resources for enhancing their understanding of the chapter. These NCERT Solutions, specifically crafted by expert educators, align with the current CBSE syllabus, ensuring relevance and accuracy.

NCERT Solutions for Class 7 Science Chapter 8, titled "Winds, Storms, and Cyclones," are integral lessons for Class 7 students. Students are encouraged to reference the NCERT textbooks and revision notes, as they serve as valuable resources for enhancing their understanding of the chapter. These NCERT Solutions, specifically crafted by expert educators, align with the current CBSE syllabus, ensuring relevance and accuracy.
Regular practice of the NCERT questions contained in Chapter 8 is essential for students aiming to secure high marks in their examinations. The availability of downloadable Winds, Storms, and Cyclones Class 7 Notes PDF simplifies access to key study materials. The solutions provided for Class 7 Science Chapter 8 are thoughtfully organized into distinct groups, facilitating comprehensive comprehension and addressing students' queries effectively.
This chapter encompasses a diverse range of concepts that are crucial for students to master. Proficiency in these concepts empowers students to comprehend, learn, and articulate them effectively in their forthcoming exams. The NCERT Solutions for Class 7 Science Chapter 8 function as a reliable reference guide, equipping Class 7 students with the necessary knowledge and skills for academic success.
For comprehensive educational support, including materials for Class 7 Science, turn to Orchids. Our user-friendly platform offers an extensive array of NCERT Solutions and educational resources. Download our app to access a wealth of enriching educational content.
The NCERT Solutions for Class 7 Science Chapter 8, titled "Winds, Storms, and Cyclones," cover a range of important topics that are crucial for students to understand. These topics include:
<ul>
<li dir="ltr" aria-level="1">
The concept of air exerting pressure.
</li>
<li dir="ltr" aria-level="1">
Understanding how high-speed winds are associated with reduced air pressure.
</li>
<li dir="ltr" aria-level="1">
Exploring the phenomenon of air expanding when heated.
</li>
<li dir="ltr" aria-level="1">
Examining how wind currents are generated due to the unequal heating of the Earth's surface.
</li>
<li dir="ltr" aria-level="1">
Understanding the variations in heating between the equator and the poles.
</li>
<li dir="ltr" aria-level="1">
Recognizing the impact of uneven heating of land and water on weather patterns.
</li>
<li dir="ltr" aria-level="1">
Exploring thunderstorms and cyclones, including the transition from a thunderstorm to a cyclone.
</li>
<li dir="ltr" aria-level="1">
Assessing the destructive potential of cyclones.
</li>
<li dir="ltr" aria-level="1">
Learning about effective safety measures to mitigate cyclone-related risks.
</li>
<li dir="ltr" aria-level="1">
Acknowledging the role of advanced technology in cyclone prediction and management.
</li>
</ul>
The NCERT Solutions serve as a comprehensive guide, offering concise explanations of these concepts. NCERT books are highly trusted educational resources, and students can rely on these solutions for effective learning.
Orchids provides NCERT Solutions for various classes and subjects, simplifying the learning process with precise and accessible materials. For Class 7 Science NCERT Solutions and resources, students can explore Orchids' comprehensive offerings. Our platform is dedicated to enhancing the educational experience for students. Download our app to access a wealth of educational content and resources.
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 8 &ndash; Winds, Storms and Cyclones Exercise Questions</h3>
1. Fill in the missing word in the blank spaces in the following statements:
(a) Wind is &mdash;&mdash;&mdash;&mdash;&mdash;&mdash; air.
(b) Winds are generated due to &mdash;&mdash;&mdash;&mdash;&mdash;&mdash; heating on the earth.
(c) Near the earth&rsquo;s surface, __________ air rises up, whereas ___________ air comes down.
(d) Air moves from a region of &mdash;&mdash;&mdash; pressure to a region of &mdash;&mdash;&mdash; pressure.
Solution:
(a) Wind is moving air.
(b) Winds are generated due to uneven heating on the earth.
(c) Near the earth&rsquo;s surface, warm air rises up, whereas cold air comes down.
(d) Air moves from a region of high air pressure to a region of low air pressure.
2. Suggest two methods to find out wind direction at a given place.
Solution:
The two methods to finding out the wind direction at a given place are as follows:
i. By seeing the direction of dry leaves released in the air.
ii By seeing the direction in which it is difficult to ride the bicycle.
3. State two experiences that made you think that air exerts pressure (other than those given in the text).
Solution:
i. When we fill the air in the balloon, it becomes tight, and if we try to fill more air, the balloon will burst which proves air exerts pressure.
ii. Wind causes curtains, doors and windows to move with the direction of the wind. This demonstrates air exerts pressure.
4. You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Solution:
It is not a good idea to buy a house without ventilators because warm air is lighter than cold air hence warm air passes out of your home through ventilators. Accordingly, without ventilators, warm air will not pass out, and the house will remain warm.
5. Explain why holes are made in hanging banners and hoardings.
Solution:
Holes in the banners and hoardings help air to pass through them. Hence, banners can withstand the pressure of the air and remains intact.
6. How will you help your neighbours in case a cyclone approaches your village/town?
Solution:
We can help our neighbours in case of a cyclone approaches by any of the following measures:
<ul>
<li dir="ltr" aria-level="1">
By helping them shift to a safer place.
</li>
<li dir="ltr" aria-level="1">
By helping them to shift their animals, necessary households and vehicles to a safer place.
</li>
<li dir="ltr" aria-level="1">
By calling emergency services such as fire stations, police, medical centres etc.
</li>
</ul>
7. What planning is required in advance to deal with the situation created by a cyclone?
Solution:
<ul>
<li dir="ltr" style="font-weight: bold;" aria-level="1">
We should not ignore the warnings issued by the meteorological department through TV, radio, or newspapers.
</li>
<li dir="ltr" aria-level="1">
We should make necessary arrangements to shift the essential household goods, domestic animals and vehicles, etc., to safer places.
</li>
<li dir="ltr" aria-level="1">
Avoid driving on roads through standing water, as floods may have damaged the roads.
</li>
<li dir="ltr" aria-level="1">
Phone numbers of all emergency services like police, fire brigade, and medical centres should be handy.
</li>
<li dir="ltr" aria-level="1">
Always store drinking water for emergencies.
</li>
<li dir="ltr" aria-level="1">
Do not touch wet switches and fallen power lines.
</li>
<li dir="ltr" aria-level="1">
Do not pressurise the rescue force by making undue demands.
</li>
<li dir="ltr" aria-level="1">
Cooperate and help your neighbours and friends.
</li>
</ul>
8. Which one of the following places is unlikely to be affected by a cyclone?
(i) Chennai
(ii) Mangaluru (Mangalore)
(iii) Amritsar
(iv) Puri
Solution:
The answer is (iii) Amritsar because Amritsar is far away from the sea, while the remaining three are coastal areas and are more likely to be hit by a cyclone.
9. Which of the statements given below is correct?
(i) In winter, the winds flow from the land to the ocean.
(ii) In summer, the winds flow from the land towards the ocean.
(iii) A cyclone is formed by a very high-pressure system with very high-speed winds revolving around it.
(iv) The coastline of India is not vulnerable to cyclones.
Solution:
The answer is (i) In winter, the winds flow from the land to the ocean.
&nbsp;

Download Class 7 Science Chapter 8 Winds, Storms and Cyclones - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 8 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 8 Winds, Storms and Cyclones - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 9, titled "Soil," are a valuable resource for 7th-grade students. These solutions have been prepared to assist students in not only resolving their queries but also in gaining a more comprehensive understanding of the chapter.

NCERT Solutions for Class 7 Science Chapter 9, titled "Soil," are a valuable resource for 7th-grade students. These solutions have been prepared to assist students in not only resolving their queries but also in gaining a more comprehensive understanding of the chapter.
The study of soil holds great significance, as it has a wide range of applications. A deeper comprehension of soil empowers students to approach their CBSE Class 7 examinations with confidence and achieve good grades. Our platform offers various types of questions, including true and false statements and multiple-choice questions, which facilitate the classification of changes within the context of soil.
These chapter-specific NCERT Class 7 Solutions are available in PDF format for easy access and downloading, providing students with a convenient and accessible resource for their learning needs.
Orchids is dedicated to supporting students in their educational journey, offering a variety of materials and resources. For Class 7 Science NCERT Solutions, students can explore Orchids' offerings. Our aim is to enhance the learning experience and promote academic success. Download our app to access a wealth of educational content and resources.
Key Topics Covered in NCERT Solutions for Class 7 Science Chapter 9, "Soil," include:
<ul>
<li dir="ltr" aria-level="1">
Soil Teeming with Life
</li>
<li dir="ltr" aria-level="1">
Soil Profile
</li>
<li dir="ltr" aria-level="1">
Types of Soil
</li>
<li dir="ltr" aria-level="1">
Properties of Soil
</li>
<li dir="ltr" aria-level="1">
Moisture in Soil
</li>
<li dir="ltr" aria-level="1">
Absorption of Water by Soil
</li>
<li dir="ltr" aria-level="1">
Soil and Crops
</li>
</ul>
These solutions for Chapter 9 are thoughtfully prepared by subject experts, aligning with the most recent CBSE syllabus for the year 2023-2024. Regular practice of these solutions is essential to help students effectively prepare for their examinations.
Utilizing these NCERT Solutions for Class 7 Science, students can systematically review all the chapters, bolstering their grasp of the subject. Orchids is dedicated to supporting students in their educational journey, offering a variety of materials and resources to foster academic excellence. Our app provides access to a wealth of educational content, making learning an enriching experience.
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 9 Soil Exercise Questions</h3>
Tick the most suitable answer in questions 1 and 2.
1. In addition to the rock particles, the soil contains
(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air and plants
Solution:
The answer is (iii) minerals, organic matter, air and water.
2. The water holding capacity is the highest in
(i) sandy soil
(ii) clayey soil
(iii) loamy soil
(iv) mixture of sand and loam
Solution:
The answer is (ii) clayey soil
3. Match the items in Column I with those in Column II:
<div dir="ltr" align="left">
<table><colgroup><col width="275"><col width="313"></colgroup>
<tbody>
<tr>
<td>
Column I
</td>
<td>
Column II
</td>
</tr>
<tr>
<td>
(i) A home for living organisms
</td>
<td>
(a) Large particles
</td>
</tr>
<tr>
<td>
(ii) Upper layer of the soil
</td>
<td>
(b) All kinds of soil
</td>
</tr>
<tr>
<td>
(iii) Sandy soil
</td>
<td>
(c) Dark in colour
</td>
</tr>
<tr>
<td>
(iv) Middle layer of the soil
</td>
<td>
(d) Small particles and packed tight
</td>
</tr>
<tr>
<td>
(v) Clayey soil
</td>
<td>
(e) Lesser amount of humus
</td>
</tr>
</tbody>
</table>
</div>
Solution:
<div dir="ltr" align="left">
<table style="width: 76.1618%; height: 326.375px;"><colgroup><col style="width: 46.4407%;" width="274"><col style="width: 53.3898%;" width="315"></colgroup>
<tbody>
<tr style="height: 54.3958px;">
<td style="height: 54.3958px;">
Column I
</td>
<td style="height: 54.3958px;">
Column II
</td>
</tr>
<tr style="height: 54.3958px;">
<td style="height: 54.3958px;">
(i) A home for living organisms
</td>
<td style="height: 54.3958px;">
(b) All kinds of soil
</td>
</tr>
<tr style="height: 54.3958px;">
<td style="height: 54.3958px;">
(ii) Upper layer of the soil
</td>
<td style="height: 54.3958px;">
(c) Dark in colour
</td>
</tr>
<tr style="height: 54.3958px;">
<td style="height: 54.3958px;">
(iii) Sandy soil
</td>
<td style="height: 54.3958px;">
(a) Large particles
</td>
</tr>
<tr style="height: 54.3958px;">
<td style="height: 54.3958px;">
(iv) Middle layer of the soil
</td>
<td style="height: 54.3958px;">
(e) Lesser amount of humus
</td>
</tr>
<tr style="height: 54.3958px;">
<td style="height: 54.3958px;">
(v) Clayey soil
</td>
<td style="height: 54.3958px;">
(d) Small particles and packed tight
</td>
</tr>
</tbody>
</table>
</div>
4. Explain how soil is formed.
Solution:
Soil is formed due to the weathering of rocks. Weathering is a process in which physical breakdown and chemical decomposition of minerals takes place primarily by wind, water and climatic changes. In the weathering process, rocks are converted to small pieces, which eventually turn to soil particles to form a layer of soil.
5. How is clayey soil useful for crops?
Solution:
Clayey soil is useful for crops for the following reasons
<ul>
<li dir="ltr" aria-level="1">
It has excellent water holding capacity
</li>
<li dir="ltr" aria-level="1">
Clayey soil is rich in organic matter
</li>
<li dir="ltr" aria-level="1">
Clayey and loamy soils are suitable for growing cereals like wheat
</li>
<li dir="ltr" aria-level="1">
Water holding-capacity of clayey soil supports the growth of crops like paddy, which require more water to grow
</li>
</ul>
6. List the differences between clayey soil and sandy soil.
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="315"><col width="274"></colgroup>
<tbody>
<tr>
<td>
Clayey Soil
</td>
<td>
Sandy Soil
</td>
</tr>
<tr>
<td>
1. Particles are finer
</td>
<td>
Particles are larger
</td>
</tr>
<tr>
<td>
2 Particles are tightly packed
</td>
<td>
Particles are loosely packed
</td>
</tr>
<tr>
<td>
3. Holds a good amount of water
</td>
<td>
Water holding capacity is low
</td>
</tr>
<tr>
<td>
4. It is heavy in weight
</td>
<td>
It is light in weight
</td>
</tr>
<tr>
<td>
5. Rich in humus and organic nutrients
</td>
<td>
Not rich in humus and organic nutrients
</td>
</tr>
<tr>
<td>
6. Very little air is trapped between the particles
</td>
<td>
More air is trapped between the particles
</td>
</tr>
</tbody>
</table>
</div>
7. Sketch the cross-section of soil and label the various layers.
Solution:
<img title="cross section of soil layers" src="https://lh7-us.googleusercontent.com/sPGPz0QTmPIiGvrusXpyeKahbKNeOIBkJ7-_UDFA7ia1tuFe2NM9l_dO73DdPfbONK8imY_SndLCbpyYMW7raU26_H6TRR90c97QxrBXijvyZTWiFsFg--y6xUHJvQ0uHjh9lamsak1QA2luOgopFcs" alt="cross section of soil layers" width="581" height="517">
8. Razia conducted an experiment in the field related to the rate of percolation. She observed that it took 40 min for 200 ml of water to percolate through the soil sample. Calculate the rate of percolation.
Solution:
Amount of water = 200 ml
Percolation time = 40 minutes
Percolation rate = <img src="https://lh7-us.googleusercontent.com/HxPGhKOKKIHa5gOwE462YHKZX0lmIqJpNJPL_lAWFxE3SjEQH7HmTTZw2DG9QjAvtegeQamFwMIxUeo0un3aTrJJAnPuAgb69-ouChgf1Av7aeH318jVbSwYfeqocLtArZoN5JDVm40Sllm47rYcS3Y" alt="calculation of water percolation rate" width="147" height="41">
= <img src="https://lh7-us.googleusercontent.com/Pf5WtXdUGgfozGziJBoLFYSYXJC4JXhIwcd5y_SCy27sR_Ye8OrRqSNzQFmkoo1ugsjb4uHzmUXjmJi2NC_KmXPiq2PG4Q3tkmYzRHMQpXHugIxlmepE59ejPP2eufVblTqdFrrd94OH_qhetkuCYMw" alt="percolation rate calculation" width="59" height="39">
= 5ml/min
9. Explain how soil pollution and soil erosion can be prevented.
Solution:
Soil pollution can be controlled by the following measures:
<ul>
<li dir="ltr" aria-level="1">
By reducing the use of plastics.
</li>
<li dir="ltr" aria-level="1">
By controlling the use of chemical fertilisers and pesticides.
</li>
</ul>
Soil erosion can be controlled by taking the following steps
<ul>
<li dir="ltr" aria-level="1">
Planting more and more trees.
</li>
<li dir="ltr" aria-level="1">
By stopping deforestation and avoiding overgrazing of animals.
</li>
</ul>
10. Solve the following crossword puzzle with the clues given:
Across
2. Plantation prevents it.
5. Use should be banned to avoid soil pollution.
6. Type of soil used for making pottery.
7. Living organism in the soil.
Down
1. In desert soil erosion occurs through.
3. Clay and loam are suitable for cereals like.
4. This type of soil can hold very little water.
5. Collective name for layers of soil.
<img title="Puzzles on Soil" src="https://lh7-us.googleusercontent.com/5VS8IipfOZ3X536elaK2z0oqYlFr-QPIuHsb0T8PS-Xp7j6zhaQTfhfZtAS5ac8LVFUb9mxodTXPPtUg3frQaJKPcWLOCmaQFA872o8Izs4XKyP3bwiaqcEMK5b1Om2f9R-Aa8n1mcudyy0tOZ0A4YU" alt="Puzzles on Soil" width="487" height="417">
Solution:
Across:
2. Erosion
5. Polythene
6. Clay
7. Earthworm
Down:
1. Wind
3. Wheat
4. Sandy
5. Profile
<img title="Puzzles on Soil" src="https://lh7-us.googleusercontent.com/6Pgs7b2g_XMdX_RPUTlQvLHDJYWsDM2pCzF1hF6MYTd2GUzVM7lgQFDM7ceZ7n4a9yRs0H5cDlvAZsLYUMTeOqEG6Np-B2FCKfEAT2XYJ2LiaVt4toplpAe9Qw4X3KneQmPE3CMFjeOJbKagSsR8aSw" alt="Puzzles on Soil" width="624" height="560">
&nbsp;

Download Class 7 Science Chapter 9 Soil - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 9 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 9 Soil - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 10, "Respiration in Organisms," holds significant importance for 7th-grade students. These solutions have been thoughtfully prepared to present the chapter's content in an engaging and educational manner. They are expertly crafted to align with the latest CBSE syllabus, making them a valuable resource for students seeking effective exam preparation.

NCERT Solutions for Class 7 Science Chapter 10, "Respiration in Organisms," holds significant importance for 7th-grade students. These solutions have been thoughtfully prepared to present the chapter's content in an engaging and educational manner. They are expertly crafted to align with the latest CBSE syllabus, making them a valuable resource for students seeking effective exam preparation.
Structured for easy comprehension, these NCERT Solutions for Class 7 Science Chapter 10 cover a broad spectrum of topics. Orchids is dedicated to providing students with the resources they need to excel in their studies. These solutions play a pivotal role in helping students grasp the concepts and perform well in their examinations. Consistent practice with these solutions is highly recommended to ensure effective preparation.
Key topics covered in NCERT Solutions for Class 7 Science Chapter 10, "Respiration in Organisms," include:
<ul>
<li dir="ltr" aria-level="1">
The significance of respiration
</li>
<li dir="ltr" aria-level="1">
The process of breathing
</li>
<li dir="ltr" aria-level="1">
Mechanics of respiration
</li>
<li dir="ltr" aria-level="1">
Exhalation and its components
</li>
<li dir="ltr" aria-level="1">
Respiration in various animal species
</li>
<li dir="ltr" aria-level="1">
Unique adaptations for underwater respiration
</li>
<li dir="ltr" aria-level="1">
An exploration of plant respiration
</li>
</ul>
Orchids proudly presents these comprehensive NCERT Solutions, designed to provide students with in-depth insights into these topics. These solutions are the result of extensive research and the expertise of Orchids' subject matter experts, making them a valuable educational resource for students.
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms Exercise Questions</h3>
1. Why does an athlete breathe faster and deeper than usual after finishing the race?
Solution:
Athletes need a lot of energy during the race, and for the release of energy, they need a lot of oxygen; hence they breathe faster than usual after finishing the race.
<img src="https://lh7-us.googleusercontent.com/dUSMWIM1zy-5SlhLDEkmvwyweBjkcaCAhrXY7_7A54spjJisCOjkMbmpdhlR0SaKt3EJRunWVUon3SaIQnUxphZh4wE2CZTG4yA-9-_-I0rnRPvO-UcAFxV9hadHPbTv1rUfCevsKPOUMmoIOKAEk0E" width="624" height="375">
679
2. List the similarities and differences between aerobic and anaerobic respiration.
Solution:
Similarities:&nbsp;
<ol>
<li dir="ltr" aria-level="1">
In both kinds of respiration, food particles are broken down to release energy
</li>
<li dir="ltr" aria-level="1">
Both occur inside the cells
</li>
<li dir="ltr" aria-level="1">
Both supply by-products
</li>
</ol>
Differences
<div dir="ltr" align="left">
<table><colgroup><col width="225"><col width="364"></colgroup>
<tbody>
<tr>
<td>
Aerobic respiration
</td>
<td>
Anaerobic respiration
</td>
</tr>
<tr>
<td>
Takes place in the presence of oxygen
</td>
<td>
Takes place in the absence of oxygen
</td>
</tr>
<tr>
<td>
End products are CO2 and H2O
</td>
<td>
End products are CO2 and alcohol
</td>
</tr>
<tr>
<td>
Produces a large amount of energy
</td>
<td>
The energy released is less when compared to aerobic respiration
</td>
</tr>
<tr>
<td>
It occurs in most plants and animals
</td>
<td>
Occurs in yeast and some bacteria
</td>
</tr>
</tbody>
</table>
</div>
<img src="https://lh7-us.googleusercontent.com/qJIQqRnoUrl8i9glzTe3IssPMabStoSSJ58o0BcAMgrZLQFbFbfR3H9y2Z1eFOJoWlSc1xOIAGF2vxogPxssztq90gVSCmUksyEsUR_t-x0r0jPPgnlt-nSllMrVm3GZPn12BnK6Ei5Psqwvvb-WOlY" width="624" height="375">
486
3. Why do we often sneeze when we inhale a lot of dust-laden air?
Solution:
When we inhale dust-laden air, the dust irritates the nose; as a reflexive action, dust is thrown out through sneezing.
4. Take three test tubes. Fill &frac34;th of each with water. Label them A, B and C. Keep a snail in test tube A, a water plant in test tube B and in C, keep both the snail and plant. Which test tube would have the highest concentration of CO2?
Solution:
Test tube A will have the highest concentration of CO2 because test tube A has a snail which expels out CO2 into the tube. Since a plant is present in both test tubes B and C, the plant will inhale CO2 to decrease CO2 concentration. Thus, there will be less concentration of CO2 in these tubes.
5. Tick the correct answer:
(a) In cockroaches, air enters the body through
(i) lungs (ii) gills (iii) spiracles (iv) skin
(b) During heavy exercise, we get cramps in the legs due to the accumulation of
(i) carbon dioxide (ii) lactic acid (iii) alcohol (iv) water
(c) Normal range of breathing rate per minute in an average adult person at rest is
(i) 9&ndash;12 (ii) 15&ndash;18 (iii) 21&ndash;24 (iv) 30&ndash;33
(d) During exhalation, the ribs
(i) move outwards (ii) move downwards (iii) move upwards (iv) do not move at all
Solution:
a) (iii) spiracles
b) (ii) lactic acid
c) (ii) 15&ndash;18
d) (ii) move downwards
6. Match the items in Column I with those in Column II:
<div dir="ltr" align="left">
<table><colgroup><col width="257"><col width="331"></colgroup>
<tbody>
<tr>
<td>
Column I
</td>
<td>
Column II
</td>
</tr>
<tr>
<td>
(a) Yeast
</td>
<td>
(i) Earthworm
</td>
</tr>
<tr>
<td>
(b) Diaphragm
</td>
<td>
(ii) Gills
</td>
</tr>
<tr>
<td>
(c) Skin
</td>
<td>
(iii) Alcohol
</td>
</tr>
<tr>
<td>
(d) Leaves
</td>
<td>
(iv) Chest cavity
</td>
</tr>
<tr>
<td>
(e) Fish
</td>
<td>
(v) Stomata
</td>
</tr>
<tr>
<td>
(f) Frog
</td>
<td>
(vi) Lungs and skin
</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>
(vii) Trachea
</td>
</tr>
</tbody>
</table>
</div>
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="260"><col width="328"></colgroup>
<tbody>
<tr>
<td>
Column I
</td>
<td>
Column II
</td>
</tr>
<tr>
<td>
(a) Yeast
</td>
<td>
(iii) Alcohol
</td>
</tr>
<tr>
<td>
(b) Diaphragm
</td>
<td>
(iv) Chest cavity
</td>
</tr>
<tr>
<td>
(c) Skin
</td>
<td>
(i) Earthworm
</td>
</tr>
<tr>
<td>
(d) Leaves
</td>
<td>
(v) Stomata
</td>
</tr>
<tr>
<td>
(e) Fish
</td>
<td>
(ii) Gills
</td>
</tr>
<tr>
<td>
(f) Frog
</td>
<td>
(vi) Lungs and skin
</td>
</tr>
</tbody>
</table>
</div>
7. Mark &lsquo;T&rsquo; if the statement is true and &lsquo;F&rsquo; if it is false:
(i) During heavy exercise, the breathing rate of a person slows down. (T/F)
(ii) Plants carry out photosynthesis only during the day and respiration only at night. (T/F)
(iii) Frogs breathe through their skins as well as their lungs. (T/F)
(iv) Fishes have lungs for respiration. (T/F)
(v) The size of the chest cavity increases during inhalation. (T/F)
Solution:
i) False
ii) False
iii) True
iv) False
v) True
8. Given below is a square of letters in which are hidden different words related to respiration in organisms. These words may be present in any direction &mdash; upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square.
<img title="Puzzle on respiration" src="https://lh7-us.googleusercontent.com/7p6kXYP0J5ntB6gnPYIG5MYroSW1Ho1cl48qLXOwVaUKu36DMcviUE0KOm_-hmw1eNSGYs0kM63uDfFfG61r2slYwaBbbbt4a2x6eDxnEk_smd8oBGuatjgyjuL7Wn3K0Zgs5jFe9VZtYlrFf2Zk08E" alt="Puzzle on respiration" width="478" height="316">
(i) The air tubes of insects
(ii) Skeletal structures surrounding the chest cavity
(iii) Muscular floor of the chest cavity
(iv) Tiny pores on the surface of a leaf
(v) Small openings on the sides of the body of an insect
(vi) The respiratory organs of human beings
(vii) The openings through which we inhale
(viii) An anaerobic organism
(ix) An organism with a tracheal system
Solution:
(i) Trachea
(ii) Ribs
(iii) Diaphragm
(iv) Stomata
(v) Spiracles
(vi) Lungs
(vii) Nostrils
(viii) Yeast
(ix) Ant
<img title="Puzzle on respiration" src="https://lh7-us.googleusercontent.com/CsNNEHRVwLgCrbvAmZFXVP-eXBdeMyrrQ0G6GzoToNeBJXvg-abMUuTCPX13o9VswxxqVD1UEjwNnCbADIV7ppFtp002ge9QgwBASJoV3It1JyCH9MAKlB3VKXPJurgXHfO3kgJ0kYWe4HS2xsvqLfM" alt="Puzzle on respiration" width="624" height="411"> 9. The mountaineers carry oxygen with them because:
(a) At an altitude of more than 5 km, there is no air.
(b) The amount of air available to a person is less than that available on the ground.
(c) The temperature of air is higher than that on the ground.
(d) The pressure of air is higher than that on the ground.
Solution:
The answer is (b). The amount of air available to a person is less than that available on the ground.

Download Class 7 Science Chapter 10 Respiration in Organisms - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 10 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 10 Respiration in Organisms - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 11, "Transportation in Animals and Plants," are essential study materials for Class 7 students. This chapter introduces students to fundamental concepts that form the basis for more advanced topics in Class 8. Achieving high marks in Class 7 Science examinations requires students to utilize NCERT Solutions while working through the exercise questions provided at the end of each chapter.

NCERT Solutions for Class 7 Science Chapter 11, "Transportation in Animals and Plants," are essential study materials for Class 7 students. This chapter introduces students to fundamental concepts that form the basis for more advanced topics in Class 8. Achieving high marks in Class 7 Science examinations requires students to utilize NCERT Solutions while working through the exercise questions provided at the end of each chapter.
To enhance accessibility, understanding, and clarity, we provide the NCERT Solutions for Class 7 Science Chapter 11 in PDF format. These solutions, practice papers, worksheets, and revision notes have been meticulously prepared by expert subject teachers to cater to the diverse learning capabilities of all students. You can access the free PDF of Chapter 11 from the provided link.
Chapter 11, "Transportation in Animals and Plants," focuses on the transport of food, water, gases, and waste products within the body. It delves into the circulatory system and the excretory system in animals, as well as the transportation system in plants. The concepts are explained in detail, and students can gain a comprehensive understanding by utilizing the NCERT Solutions for Class 7 Science.
Important Topics Covered in NCERT Solutions for Class 7 Science Chapter 11, "Transportation in Animals and Plants," include:
<ul>
<li dir="ltr" aria-level="1">
Circulatory System
</li>
<li dir="ltr" aria-level="1">
The Excretory System in Animals
</li>
<li dir="ltr" aria-level="1">
The Transportation System in Plants
</li>
</ul>
To excel in the examination, students are encouraged to practice Class 7 previous years' science question papers and sample papers. These practice materials will help students become familiar with the types of questions asked in the examination and understand the marking scheme.
For the latest updates and notifications, students can keep visiting Orchids. We offer a wide range of educational resources, including NCERT notes, books, exemplar problems, and chapter-wise NCERT Solutions for various subjects from Classes 1 to 12.
It's essential for students to thoroughly solve the textbook questions before the annual exam. These solutions, designed by expert faculty at Orchids, can also help clarify doubts that arise during class. By utilizing these resources, students can enhance their self-learning abilities, which, in turn, will aid in comprehending new concepts and building a strong foundation in fundamental topics.
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 11 Transportation in Animals and Plants Exercise Questions</h3>
1. Match structures given in Column I with functions given in Column II.
<div dir="ltr" align="left">
<table><colgroup><col width="197"><col width="391"></colgroup>
<tbody>
<tr>
<td>
Column- I
</td>
<td>
Column-II
</td>
</tr>
<tr>
<td>
(i) Stomata
</td>
<td>
(a) Absorption of water
</td>
</tr>
<tr>
<td>
(ii) Xylem
</td>
<td>
(b) Transpiration
</td>
</tr>
<tr>
<td>
(iii) Root hairs
</td>
<td>
(c) Transport of food
</td>
</tr>
<tr>
<td>
(iv) Phloem
</td>
<td>
(d) Transport of water
</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>
(e) Synthesis of carbohydrates
</td>
</tr>
</tbody>
</table>
</div>
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="233"><col width="355"></colgroup>
<tbody>
<tr>
<td>
Column- I
</td>
<td>
Column-II
</td>
</tr>
<tr>
<td>
(i) Stomata
</td>
<td>
(b) Transpiration
</td>
</tr>
<tr>
<td>
(ii) Xylem
</td>
<td>
(d) Transport of water
</td>
</tr>
<tr>
<td>
(iii) Root hairs
</td>
<td>
(a) Absorption of water
</td>
</tr>
<tr>
<td>
(iv) Phloem
</td>
<td>
(c) Transport of food
</td>
</tr>
</tbody>
</table>
</div>
2. Fill in the blanks.
(i) The blood from the heart is transported to all parts of the body by the _____________.
(ii) Haemoglobin is present in _____________ cells.
(iii) Arteries and veins are joined by a network of _____________.
(iv) The rhythmic expansion and contraction of the heart is called the _____________.
(v) The main excretory product in human beings is _____________.
(vi) Sweat contains water and _____________.
(vii) Kidneys eliminate the waste materials in the liquid form called _____________.
(viii) Water reaches great heights in the trees because of suction pull caused by _____________.
Solution:
(i) The blood from the heart is transported to all parts of the body by the arteries.
(ii) Haemoglobin is present in red blood cells.
(iii) Arteries and veins are joined by a network of capillaries.
(iv) The rhythmic expansion and contraction of the heart is called the heartbeat.
(v) The main excretory product in human beings is urea.
(vi) Sweat contains water and salts.
(vii) Kidneys eliminate the waste materials in the liquid form called urine.
(viii) Water reaches great heights in the trees because of suction pull caused by transpiration.
3. Choose the correct option:
(a) In plants, water is transported through
(i) xylem
(ii) phloem
(iii) stomata
(iv) root hair
(b) Water absorption through roots can be increased by keeping the plants
(i) in the shade
(ii) in dim light
(iii) under the fan
(iv) covered with a polythene bag
Solution:
a) i) xylem
b) iii) under the fan
4. Why is the transport of materials necessary in a plant or in an animal? Explain.
Solution:
Transport of materials is necessary for both plants and animals as every cell needs a regular supply of nutrients and oxygen to release energy through respiration.
The food that we eat is broken down into smaller components to be absorbed by cells. The oxygen we inhale also has to be transported to all the cells of the body. Our body also requires the constant removal of waste materials such as carbon dioxide.
For the transport of all these materials (nutrients, oxygen and waste products), our body has a specialised transport system.&nbsp;
Similarly, in plants, the transport of water and food is accomplished with the help of vascular tissues (xylem and the phloem).&nbsp;
5. What will happen if there are no platelets in the blood?
Solution:
If there are no platelets, then blood will not clot as platelets release blood clotting factor at the site of injury and stop further bleeding.
6. What are stomata? Give two functions of stomata.
Solution:
Tiny pores present on the leaf surface are known as stomata.
Functions of stomata
<ul>
<li dir="ltr" aria-level="1">
It helps in the exchange of gases
</li>
<li dir="ltr" aria-level="1">
Evaporation of water through leaves occurs due to stomata.
</li>
</ul>
7. Does transpiration serve any useful function in plants? Explain.
Solution:
Transpiration serves the following functions in plants
<ul>
<li dir="ltr" aria-level="1">
It helps in lowering the temperature of plants, thus preventing heat injury to plants.
</li>
<li dir="ltr" aria-level="1">
It helps in transpiration pull, which helps in raining water on higher plants.
</li>
<li dir="ltr" aria-level="1">
It also causes loss of water absorbed by plants.
</li>
</ul>
8. What are the components of blood?
Solution:
The components of blood are red blood cells, white blood cells, platelets and plasma.
9. Why is blood needed by all the parts of a body?
Solution:
Blood is a significant part of the transport system in our body, and we need blood for the following reasons:
<ul>
<li dir="ltr" aria-level="1">
For the transport of oxygen to all parts of our body
</li>
<li dir="ltr" aria-level="1">
To expel carbon dioxide from our body
</li>
<li dir="ltr" aria-level="1">
To transmit heat, thus helping in the regulation of body temperature.
</li>
<li dir="ltr" aria-level="1">
It is required to fight out infections and diseases.
</li>
</ul>
10. What makes the blood look red?
Solution:
The presence of a red pigment called haemoglobin in red blood cells (RBC) makes the blood appear red.
11. Describe the function of the heart.
Solution:
The heart is an organ which beats continuously to act as a pump for the transport of blood, which carries other substances with it. The heart has four chambers. The two upper chambers are called the atria (singular: atrium), and the two lower chambers are called the ventricles. The partition between the chambers helps to avoid mixing up blood-rich in oxygen with the blood-rich in carbon dioxide. Blood flows from the heart to the lungs and back to the heart, from where it is pumped to the rest of the body.
<img title="human heart" src="https://lh7-us.googleusercontent.com/mlGdAnJdn_X-mSHAUtOeDakN7L0vZu9uQJvuCmXlIBaOgv3tSFyjqDtK_ipviNuzj0k8YuToxlUXDXZTHxp4nZsNPZebEMJmLFdt3Z07MDMADo8Sya_ZIogDd4PNFmFI0Jt7r-dALyF5CEYeKOcS1GM" alt="human heart" width="416" height="302"> 12. Why is it necessary to excrete waste products?
Solution:
When the cells in the body perform their functions, certain waste products are released. These are toxic and hence need to be removed from the body.
13. Draw a diagram of the human excretory system and label the various parts.
Solution:
<img title="human excretory system" src="https://lh7-us.googleusercontent.com/TYsdJnDMHEZE4HGIYAXWXwoIPrJXsQLg6gWNFODAHRJbR3HMjr8vXnoEGBVnJNJDX2I8xzsq7ixA2UgwY7GUPmaaznqmtceQEcl3-OYo1GCG7C-6_LZIB_OXYx4bkHdYHkfN594H0m79gKexXb2gCjM" alt="human excretory system" width="391" height="621">
&nbsp;

Download Class 7 Science Chapter 11 Transportation in Animals and Plants - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 11 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 11 Transportation in Animals and Plants - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 12, "Reproduction in Plants," cover an essential and engaging topic for CBSE Class 7 students. These NCERT Solutions have been meticulously designed to assist students in learning and practicing questions related to plant reproduction.

NCERT Solutions for Class 7 Science Chapter 12, "Reproduction in Plants," cover an essential and engaging topic for CBSE Class 7 students. These NCERT Solutions have been meticulously designed to assist students in learning and practicing questions related to plant reproduction.
Chapter 12 of Class 7 Science introduces the concept of reproduction in plants, explaining various aspects such as modes of reproduction, sexual reproduction, fruit and seed formation, and seed dispersal. The NCERT Solutions for this chapter provide solved exercises with relevant examples, enabling students to prepare effectively for their exams. The solutions encompass both objective (MCQs) and long/short-type questions, offering insight into the exam pattern and marking scheme.
About Reproduction in Plants: Reproduction is the process of producing new offspring from parents. For 7th-grade students, reproduction in plants is a new concept. This chapter serves as an introduction to the modes of plant reproduction and further delves into sexual reproduction, the formation of fruits and seeds, and seed dispersal.
Orchids, with a vision to provide world-class learning content for ambitious students aiming to excel in exams, have thoughtfully developed these solutions to enhance students' learning capabilities. The NCERT Solutions, part of the comprehensive resources available on our website, are designed to empower students in their learning journey.
The benefits of Orchids' NCERT Solutions for Class 7 Science are numerous. They allow students to practice and revise various topics from the comfort of their homes by downloading chapter-wise PDFs. These solutions can be accessed from anywhere with an internet connection, enabling students to tailor their learning experience and progress at their own pace.
In addition to these solutions, Orchids provides access to subject experts with relevant experience, offering students a more engaging, comprehensive, and clear understanding of the subject matter. Regular feedback on student performance is provided, and a responsive support team is available to address any doubts or concerns. Students can also explore Orchids &ndash; The Learning App for an even more efficient and enjoyable learning experience.
Important topics covered in NCERT Solutions for Class 7 Science Chapter 12, "Reproduction in Plants," include:
<ul>
<li dir="ltr" aria-level="1">
Sexual Reproduction in Plants
</li>
<li dir="ltr" aria-level="1">
Formation of Fruits and Seeds
</li>
<li dir="ltr" aria-level="1">
Dispersal of Seeds
</li>
</ul>
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 12 Reproduction in Plants Exercise Questions</h3>
 1. Fill in the blanks: (a) Production of new individuals from the vegetative part of parent is called_____________. (b) A flower may have either male or female reproductive parts. Such a flower is called_____________. (c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as _____________. (d) The fusion of male and female gametes is termed as _____________. (e) Seed dispersal takes place by means of _____________, _____________ and _____________. Solution: (a) Production of new individuals from the vegetative part of parent is called vegetative propagation. (b) A flower may have either male or female reproductive parts. Such a flower is called unisexual flower. (c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as Pollination. (d) The fusion of male and female gametes is termed as fertilisation. (e) Seed dispersal takes place by means of wind, water and animals.
2. Describe the different methods of asexual reproduction. Give examples. Solution:
Different methods of asexual reproduction are as follows:
Vegetative Propagation
In this asexual reproduction, new plants are produced from roots, stems, leaves and buds of the individual plant.
Examples &ndash; Tuber of potato, the rhizome of ginger.
Budding
The bud is a small projection which gradually grows and gets detached from the parent cell and forms a new yeast cell. The new yeast cell grows, matures and produces more yeast cells.
Example &ndash; Yeast.
Fragmentation
In this mode of reproduction, the growth and multiplication are done by rapidly breaking down into two or more fragments. Each fragment grows into new individuals when water and nutrients are available.
Example &ndash; Algae
Spore Formation
This reproduction is done by spores which, under favourable conditions, germinate and develop into a new individual.
Examples &ndash; Fungi like Rhizopus, Mucor, etc.
Fission
It is a type of asexual reproduction where the unicellular organism splits to form new organisms.&nbsp; There are two types of fission which are,
<ul>
<li dir="ltr" aria-level="1">
Binary fission
</li>
<li dir="ltr" aria-level="1">
Multiple fission
</li>
</ul>
Examples
Unicellular organisms that undergo binary fission are amoeba, paramecium, leishmania, etc.
Plasmodium undergoes the process of multiple fission.
&nbsp;
3. Explain what you understand by sexual reproduction. Solution: Sexual reproduction is a method where male and female gametes fuse to form a new individual. In plants, stamens and pistils are male and female reproductive organs which bear the anthers and ovary, respectively.
4. State the main difference between asexual and sexual reproduction. Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="284"><col width="305"></colgroup>
<tbody>
<tr>
<td>
Asexual reproduction
</td>
<td>
Sexual reproduction
</td>
</tr>
<tr>
<td>
It requires only one parent
</td>
<td>
Requires a male and female parent
</td>
</tr>
<tr>
<td>
Daughter cells formed are identical to parents and to each other.
</td>
<td>
Newly formed offsprings show variations in comparison to the parents.
</td>
</tr>
<tr>
<td>
Special reproductive organs are not required
</td>
<td>
Special reproductive organs are required
</td>
</tr>
<tr>
<td>
Ex: Yeast, rose, jasmine
</td>
<td>
Ex: Insects, animals
</td>
</tr>
</tbody>
</table>
</div>
&nbsp;
5. Sketch the reproductive parts of a flower. Solution: <img title="reproductive parts of a flower" src="https://lh7-us.googleusercontent.com/fW7L7KPW0VDjHtIOC_tAJAv8j-Q9M-rhFmanxDty7n9pdWIwPc5Sy84jT-fg3yW-8IdeoLiVIb7WUO-o91V3KN11U7kZ2qH03zta57aHAzJHZ9syVKFkRJaecl508b6LE6lyyKIh3EAK2cGJ1q9nJKA" alt="reproductive parts of a flower" width="278" height="555">
6. Explain the difference between self-pollination and cross-pollination. Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="262"><col width="326"></colgroup>
<tbody>
<tr>
<td>
Self-pollination
</td>
<td>
Cross-pollination
</td>
</tr>
<tr>
<td>
In self-pollination, pollen grains are transferred from the anther to the stigma of the same flower.
</td>
<td>
In cross-pollination, pollen grains are transferred from the anther of one flower to the stigma of another flower of the same kind.
</td>
</tr>
<tr>
<td>
Self-pollination occurs only in bisexual flowers
</td>
<td>
It occurs in both unisexual and bisexual flowers
</td>
</tr>
</tbody>
</table>
</div>
&nbsp;
7. How does the process of fertilisation take place in flowers? Solution: The process of fusion of male and female gametes (to form a zygote) is called fertilisation. The zygote develops into an embryo, and the embryo undergoes mitotic cell division to form seeds.
8. Describe the various ways by which seeds are dispersed. Solution: Seeds and fruits of plants are carried away by the wind, water and animals. Winged seeds such as those of drumstick and maple, light seeds of grasses or hairy seeds of aak (Madar) and hairy fruit of the sunflower get blown off with the wind to faraway places. Some seeds are dispersed by water. These fruits or seeds usually develop floating ability in the form of a spongy or fibrous outer coat as in coconut. Some seeds are dispersed by animals, especially spiny seeds with hooks which get attached to the bodies of animals and are carried to distant places. Examples are Xanthium and Urena. Some seeds are dispersed when the fruits burst with sudden jerks. The seeds are scattered far from the parent plant. This happens in the case of castor and balsam.
9. Match items in Column I with those in Column II: Column I Column II
<div dir="ltr" align="left">
<table><colgroup><col width="303"><col width="286"></colgroup>
<tbody>
<tr>
<td>
Column-I
</td>
<td>
Column-II
</td>
</tr>
<tr>
<td>
(a) Bud
</td>
<td>
(i) Maple
</td>
</tr>
<tr>
<td>
(b) Eyes
</td>
<td>
(ii) Spirogyra
</td>
</tr>
<tr>
<td>
(c) Fragmentation
</td>
<td>
(iii) Yeast
</td>
</tr>
<tr>
<td>
(d) Wings
</td>
<td>
(iv) Bread mould
</td>
</tr>
<tr>
<td>
(e) Spores
</td>
<td>
(v) Potato
</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>
(vi) Rose
</td>
</tr>
</tbody>
</table>
</div>
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="303"><col width="285"></colgroup>
<tbody>
<tr>
<td>
Column-I
</td>
<td>
Column-II
</td>
</tr>
<tr>
<td>
(a) Bud
</td>
<td>
(iii) Yeast
</td>
</tr>
<tr>
<td>
(b) Eyes
</td>
<td>
(v) Potato
</td>
</tr>
<tr>
<td>
(c) Fragmentation
</td>
<td>
(ii) Spirogyra
</td>
</tr>
<tr>
<td>
(d) Wings
</td>
<td>
(i) Maple
</td>
</tr>
<tr>
<td>
(e) Spores
</td>
<td>
(iv) Bread mould
</td>
</tr>
</tbody>
</table>
</div>
&nbsp;
10. Tick the correct answer: (a) The reproductive part of a plant is the (i) leaf (ii) stem (iii) root (iv) flower (b) The process of fusion of the male and the female gametes is called (i) fertilisation (ii) pollination (iii) reproduction (iv) seed formation (c) Mature ovary forms the (i) seed (ii) stamen (iii) pistil (iv) fruit (d) A spore-producing organism is (i) rose (ii) bread mould (iii) potato (iv) ginger (e) Bryophyllum can reproduce by its (i) stem (ii) leaves (iii) roots (iv) flower Solution: a) (iv) flower b) (i) fertilization c) (iv) fruit d) (ii) bread mould e) (ii) leaves
&nbsp;

Download Class 7 Science Chapter 12 Reproduction in Plants - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 12 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 12 Reproduction in Plants - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 13, "Motion and Time," are valuable study materials that can significantly aid students in preparing for the CBSE Class 7 examination. These meticulously crafted solutions for Chapter 13 of Class 7 Science, designed by expert teachers, align with the latest syllabus of the Central Board of Secondary Education (CBSE).

NCERT Solutions for Class 7 Science Chapter 13, "Motion and Time," are valuable study materials that can significantly aid students in preparing for the CBSE Class 7 examination. These meticulously crafted solutions for Chapter 13 of Class 7 Science, designed by expert teachers, align with the latest syllabus of the Central Board of Secondary Education (CBSE).
Chapter 13 is a crucial physics chapter that delves into the fundamentals of speed, covering various aspects such as types of speed, speed calculations, and the practical applications of speed and motion in our daily lives. The chapter includes real-life demonstrations to instill curiosity and interest in students, facilitating an in-depth understanding of the topic.
The Central Board of Secondary Education (CBSE) is one of India's prominent educational boards, and these NCERT Solutions for Class 7 Science, "Motion and Time," have been provided to help students gain a profound understanding of the chapter's concepts and address any doubts they may have.
Important topics covered in NCERT Solutions for Class 7 Science Chapter 13, "Motion and Time," include:
<ul>
<li dir="ltr" aria-level="1">
Slow/Fast &ndash; Determining the relative speed of objects based on the distance they move in a given time interval.
</li>
<li dir="ltr" aria-level="1">
Speed &ndash; Defining an object's speed as the distance it covers in a unit of time.
</li>
<li dir="ltr" aria-level="1">
Measurement of Time
</li>
<li dir="ltr" aria-level="1">
Measurement of Speed
</li>
<li dir="ltr" aria-level="1">
Distance-Time Graph
</li>
</ul>
To access NCERT Solutions for all the chapters of Class 7 Science, please visit Orchids. You can also download Class 7 Science exemplar problems, worksheets, e-books, and previously solved question papers for comprehensive preparation.
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 13 Motion and Time Exercise Questions</h3>
1. Classify the following as motion along a straight line, circular or oscillatory motion:
(i) Motion of your hands while running.
(ii) Motion of a horse pulling a cart on a straight road.
(iii) Motion of a child in a merry-go-round.
(iv) Motion of a child on a see-saw.
(v) Motion of the hammer of an electric bell.
(vi) Motion of a train on a straight bridge.
Solution:
i) Oscillatory
ii) Motion along a straight line
iii) Circular motion
iv) Oscillatory motion
v) Oscillatory motion
vi) Motion along a straight line.
2. Which of the following are not correct?
(i) The basic unit of time is second.
(ii) Every object moves with a constant speed.
(iii) Distances between two cities are measured in kilometres.
(iv) The time period of a given pendulum is constant.
(v) The speed of a train is expressed in m/h.
Solution:
Incorrect statements are:
(ii) Every object moves with a constant speed.
(iv) The time period of a given pendulum is constant.
(v) The speed of a train is expressed in m/h.
3. A simple pendulum takes 32 s to complete 20 oscillations. What is the time period of the pendulum?
Solution:
Number of oscillations = 20
Total time taken to complete 20 oscillations = 32 s
<img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/0OibmodSFyPLymtbNYNPGI1_Ce2wIHcgnMlqNVRWCd4bpWjEy0CuQvnqFpGA3ZfJ1UmlTL6pQqNc2SE4TVFBldu3DMQ9b4fO_ul-3HelamHWIZ7xPCHupGR3yculBdZeb82fve_HFhU42yJg-eB9Beo" alt="time period calculation" width="285" height="101">
4. The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.
Solution:
Distance between two stations = 240 kms
Total time take = 4 hrs/240 minutes
<img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/2iFYBpM6oAx7x3JJr_pMLcxN5pvq7Sasutj7k8XxtmKbZE7gpo1lDzQk01N0VOQYe7h0OsSHqSSwB4nezNG_3afN8NqKxuVRbYEl1iDgRJnHBVr0drG0ccjyMvnaV0iGyxMzo-CywOz354UIboSJB20" alt="Speed calculation" width="162" height="85">
= 60 km/h
5. The odometer of a car reads 57321.0 km when the clock shows the time 08:30 AM. What is the distance moved by the car, if at 08:50 AM, the odometer reading has changed to 57336.0 km? Calculate the speed of the car in km/min during this time. Express the speed in km/h also.
Solution:
Initial reading of the odometer = 57321.0
Final reading of the odometer = 57336.0
Distance covered by the car = Final reading of the odometer &ndash; Initial reading of the odometer
= 57336.0 &ndash; 57321.0 = 15 kms
Starting time of car is 8:30 and it stops at 8:50
Hence, time taken by car = 20 mins
<img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/kqe-mAM26ZTgKDdZ_xAKBgQ5fVXpSTjgfSAtaHTxd7umEL35V5UGnnY1aJz_VmwAJrunKV7Arxa4-nCMK6eGb5J_3XjtRl4IQ1WiaCFRp8nBPu8XZGqIkkIL4FyNPqEfsVNkqfY0jjzTqnXSLrx72D8" alt="speed calculation" width="271" height="275">
= 45 km/h
6. Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.
Solution:
Time taken by Salma to reach her school by bicycle = 15 mins= 15 x 60 = 90 s
Speed of Salma&rsquo;s bicycle= 2m/s
<img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/6iBk79Vq5UTuVsOwWilW6aHVvL_zfHb4TKO4gR03Do3YsTXGI6xZI7Pv_xK-aHRY7ysz1bm9tBPfGITE9Hp9zMxzgsbQwASQWF2nWH-ZT4KUpsx43Wz6_EwHGctPGGlEnSVnxf5Nujq44ZtN_zzCmpQ" alt="Speed formula" width="168" height="45">
Distance covered = speed x time taken
= 2 x 900 = 1800 m
1000m = 1 km
<img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/zNvSjEHz-cSgmN9giqFDmI9fBhPWfWkL6ZlBqCBCsPCrFTqa4MpY-6i26hbzzQVJCn4bC0xpRowwA_SLmLi7zno4EsV7KTiQG5htbi7oPtme-Ht3zlqrzpTc70EQiLvRD_bq253uIfaehzULihpBKRY" alt="distance covered calculation" width="194" height="64">
= 1.8 kms
7. Show the shape of the distance-time graph for the motion in the following cases:
(i) A car moving with a constant speed.
(ii) A car parked on a side road.
Solution:
<img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/NtkZ2EhLZ9rji244bLA4Q3gpdX-QKZ9sN0mURn0K9WpUfKQGZZSeyNIJMVAfFKH6ZTUbvIVRkJQT0o3kkz8nBNkC2c7mALXMRP8OhZUDDj1EuRnl7Ruez1uGPJB048QwdHaKyPUA93QVT_aEud92sMo" alt="Distance time graph" width="624" height="287"> <img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/-d-plSqI22LQz5pU5cFdQKFtwxui99sxD-ehFbG1gH-AHOKdkeJC1m1_oEmN8MsOe0o-XAqPnhQXczvlemcEK7y6esrnEg1esSXp8WnAhzUiTa0zAsiekprYL1yNNTQbPAhXTgh5MjBcb1Jh3e7l67Q" alt="Distance time graph" width="624" height="288">
8. Which of the following relations is correct?
(i) Speed = Distance &times; Time
(ii) Speed = Distance/Time
(iii) Speed = Time/Distance
(iv) Speed = 1/Distance x Time
Solution:
Answer is (ii) Speed = Distance/Time
9. The basic unit of speed is:
(i) km/min
(ii) m/min
(iii) km/h
(iv) m/s
Solution:
Answer is (iv) m/s
10. A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:
(i) 100 km (ii) 25 km (iii) 15 km (iv) 10 km
Solution:
The answer is (ii) 25 km
Calculation:
When the speed of the car is 40 km/h
Time taken = 15 min = 15/60 = 0.25 h
<img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/l3v_ioasqeVx3A-EUE5g_-w7rxm7AqUrELu5yw3OfsxD6yUj9UhA_aaRzWN5BFtj38bPAZ5C5UPFL8-vuoTRTutyeRDXWbcyv5yyH9Wyy1n2jL2Xy7CpUtozVyfyDiD9SGrmzePp63Ph0DL8giVPq_M" alt="Speed formula" width="168" height="45">
Distance covered d1 = speed x time taken
= 40 x 0.25 = 10 kms
When the speed of the car is 60 km/ h
<img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/436f2sLhm6azgTecSB2-agnqxot5wDWCYpWWXrGv-lPOx96EKiZ-IZqkwWHOJqlptIq61EhnnK2jG5D4LSmoR9ILtvoxpTsAMz-hRlLu_icqC1Pxm-cgC79XlxYz9oAHO6xqpE7rRM9_n22WypHP7Tc" alt="Speed formula" width="168" height="45">
Distance covered d2 = speed x time taken
= 60 x 0.25= 15 kms
Total distance covered by the car = d1 + d2
= 10 + 15
= 25 kms
11. Suppose the two photographs, shown in Fig. 13.1 and Fig. 13.2, had been taken at an interval of 10 seconds. If a distance of 100 metres is shown by 1 cm in these photographs, calculate the speed of the fastest car.
<img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/HxugBRuYU88QiOJ3OBYpopjYOClEeKgRJThHdd1P2cudH773Pevg5jyfTH3qXGKYQYcwWpNktAVgSPCxprlXxePow4eFitSs2l8hm6g_BX9cbFao6oJU65JSFqmYPKOsQk8PkB_yyJBxFlmWXn9yQsE" alt="Speed calculation" width="343" height="580">
Solution:
The distance covered by the blue car (as evident from the photograph) from one horizontal white strip to another, which is measured by scale is 1.2 cm.
It is given that 1 cm is equivalent to 100 m.
Therefore, 1.2 cm is equivalent to 120 m.
Distance travelled by the car = 120 m
Time taken to cover this distance = Time interval between the two photographs = 10 s
<img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/8qkszFlDFmhFqOGDRyVpCwtsjPcwuDBad83vA0G9MJIY9D8K63-AJtriixWx9LIROE_jabYE4vs78dDeoYZBu_czlk7NVzUbbJD9IKECxnNtoK9JrZIyWrn8JPBbZYLVWEQU9pmh0kTRA7sRpqyHwIM" alt="Speed formula" width="168" height="45">
= 120/10
= 12 m/s
12. Fig. 13.15 shows the distance-time graph for the motion of two vehicles A and B. Which one of them is moving faster?
&nbsp;
Solution:
Vehicle A is moving faster than vehicle B.
13. Which of the following distance-time graphs shows a truck moving with speed which is not constant?
<img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/go-WEY82PxUn5e0BhyLdexsQ8GgYQ6hMRBDYou46SWwTDZkuQ7P8sc7ZBf27yzhtpygRx6MV4nL5o1nhqHJTIkEdhL0gacVYP845nM0kFyarO_Wkrx6n0tX2YB2I-0CHJj6ijZdZpH0-20LT6KpRVBA" alt="Distance time graph" width="381" height="185"> <img title="Chapter 13: Motion and Time" src="https://lh7-us.googleusercontent.com/agMnER8khw0XFq0In7YTJdbEtRN_hSONKmz3KvcdaTuE2XR1dQIobdJT5-jY1K-FPf02_cfz9iSAccu3d8nKa9ox0EppbWsBE-7QxGG0Pns2DuuQDUchNMaE9hGIpT55eOTxPAwqqnZh-P89FU00o18" alt="Distance time graph" width="523" height="279">
Solution:
Answer is iii)
&nbsp;

Download Class 7 Science Chapter 13 Motion and Time - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 13 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 13 Motion and Time - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 14, "Electric Current and Its Effects," are of paramount importance for Class 7 students. These solutions have been thoughtfully provided to facilitate a comprehensive understanding of the chapter in an engaging and straightforward manner. Expert subject teachers have meticulously crafted these NCERT Solutions, aligning with the latest CBSE syllabus for the academic year 2023-2024. Consistent practice of these solutions is essential to prepare effectively for the annual examinations. Access the PDF for Class 7 Chapter 14 Science NCERT Solutions below.

NCERT Solutions for Class 7 Science Chapter 14, "Electric Current and Its Effects," are of paramount importance for Class 7 students. These solutions have been thoughtfully provided to facilitate a comprehensive understanding of the chapter in an engaging and straightforward manner. Expert subject teachers have meticulously crafted these NCERT Solutions, aligning with the latest CBSE syllabus for the academic year 2023-2024. Consistent practice of these solutions is essential to prepare effectively for the annual examinations. Access the PDF for Class 7 Chapter 14 Science NCERT Solutions below.
Key Topics Covered in NCERT Solutions for Class 7 Science Chapter 14, "Electric Current and Its Effects," include:
<ul>
<li dir="ltr" aria-level="1">
Symbols of Electric Components
</li>
<li dir="ltr" aria-level="1">
Heating Effect of Electric Current
</li>
<li dir="ltr" aria-level="1">
Magnetic Effect of Electric Current
</li>
<li dir="ltr" aria-level="1">
Electromagnet
</li>
<li dir="ltr" aria-level="1">
Electric Bell
</li>
</ul>
A comprehensive understanding of electric current concepts is vital for Class 7 students. The topics covered in the NCERT Class 7 textbooks play a pivotal role in examinations. It is imperative for students to practice symbols, circuit diagrams, formulas, and problems to achieve good marks. BYJU&rsquo;S provides downloadable e-books, notes, PDFs, and previously solved question papers, enabling students to initiate their exam preparation promptly.
For in-depth knowledge about representing electric components using symbols, drawing circuit diagrams, understanding the heating effect of current and its applications, electric fuses, the magnet-like behavior of electric current when flowing through a wire, electromagnets, and their applications, sign up with BYJU&rsquo;S &ndash; The Learning App. Registration with BYJU&rsquo;S is a straightforward process, providing easy access to online courses.
In addition to NCERT Solutions for Class 7 Science Chapter 14, access NCERT Solutions for other chapters of Class 7 Science. Students can download worksheets, assignments, NCERT Class 7 Science Solutions, and various study materials to aid in exam preparation and achieve high scores.
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects Exercise Questions</h3>
1. Draw in your notebook the symbols to represent the following components of electrical circuits: Connecting wires, switch in the &lsquo;OFF&rsquo; position, bulb, cell, switch in the &lsquo;ON&rsquo; position, and battery.
Solution:
<img title="NCERT Solutions For Class 7 Science Chapter 14" src="https://lh7-us.googleusercontent.com/2_A0HPfOgfoGnJKePt2VmFR7YWhiEOYARnLISw3PDkHJ43euMRTrZe7IpSpCrAb3WIq2K3waeWFr17DcvNKtlfP7TpDrNlhCqMjoMEzhe6ANQJHUHUWkQH1jmKkg2caJk5qdos8PGl6oi9JTZNuZ67A" alt="Electric currents symbols" width="238" height="191">
2. Draw the circuit diagram to represent the circuit shown in Fig.14.21.
<img title="NCERT Solutions For Class 7 Science Chapter 14" src="https://lh7-us.googleusercontent.com/_OStD9_3hQPzGuJL2vaE7cEk8vnU3En9SWNnOGlH0DUWcvOICu80gQ92X2ex3iNb4yDvSOZW7b1mvpQTpqby7AypA-CfHyMSxBPle66QOn-wLLUoH-6stlBTGHXrtR6s8lVGeyoob2NcATI2xCnE9p4" alt="circuit diagram" width="340" height="253">
Solution:
<img title="NCERT Solutions For Class 7 Science Chapter 14" src="https://lh7-us.googleusercontent.com/qjJFhVvghxCfnZvJm57_hzRjLuLRT7JKO8zaMbVJOZRRKo-Ey1yFH3vcMJ_HrT6SYLskLekaaL3cxRfzOZG282oa8rskvTYbVNSrnzF4DXRALrZxBSk0Yn2S2zaY7bsrG0Eh3Q4Fev06CQLcs0fKqkk" alt="circuit diagram" width="624" height="292">
3. Fig.14.22 shows four cells fixed on a board. Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells.
<img title="NCERT Solutions For Class 7 Science Chapter 14" src="https://lh7-us.googleusercontent.com/IKWJT0AykjUD7QdI-Km_v7Pbrcr1ZUEiwxC55TF_KiVUzMJcDXfiArujzDRIxGO2sKNrr9_vYcjutQh3YQrqv275t57GdtGO6P9w66T3RTPnDn9eIrQVOlYqS-MmFeLqVWYMZk7xQWlsorFNFKWjsbw" alt="baterry cell" width="415" height="233">
Solution:
<img title="NCERT Solutions For Class 7 Science Chapter 14" src="https://lh7-us.googleusercontent.com/hbrtqhSCtEflRk8cSDPH2JPPNywbq37izBq-TNDkj_oeIJxrfyPPn-h4YFKTL8JSNwxiDbsdJTWVLiNpEYlR3dnotnoEhUTQgqOVWDsg1VVuzRuuEBwJBp_fiEC0UOzTlCb_O2JlwqQIPA6C5zSnBbU" alt="completed circuit" width="329" height="152">
4. The bulb in the circuit shown in Fig.14.23 does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.
<img title="NCERT Solutions For Class 7 Science Chapter 14" src="https://lh7-us.googleusercontent.com/laKQuGuEVEm2CFCb0ZN7bIIqXnrBv3Oom69MzxFeqXbZsgSuqvLfUtWiZmxMfO5YqGzI7DtVejINTNMKRnupil3o5cyF7nfgtosBBWLIeUXa6BEyttObM05DYOGREHEzDKASvwNtw2LdrHINLa9PWw4" alt="wrong electric circuit" width="270" height="150">
Solution:
In the circuit above, the bulb is connected on either side.
<img title="NCERT Solutions For Class 7 Science Chapter 14" src="https://lh7-us.googleusercontent.com/wrCNPk8fuoz7MvmuDidIvLanmG_cxSfT61xOhTDXbNDXiRSdBBeKL0cOKzrpNA87nDKFtH6ZK2k1o41RF4hR3umpakVNdJ3M7GD13flXJ_zkbtBMwPoxvPl8Na41xykjSdFnFjbbpUF711oqn-7AGqY" alt="circuit diagram" width="346" height="132">
5. Name any two effects of electric current.
Solution:
i) Heating effect of electric current
ii) Magnetic effect of electric current
6. When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.
Solution:
When the current is switched on through a wire, the magnetic field is created around it hence we see deflection in the compass needle kept nearby.
7. Will the compass needle show deflection when the switch in the circuit shown by Fig.14.24 is closed?
<img title="NCERT Solutions For Class 7 Science Chapter 14" src="https://lh7-us.googleusercontent.com/BPB7R7UAeO1CNPi62UuSLy2-b1-msmflfp0QgxAE_rp0GHeg1qbIiwjE1x4ztlln0opl2MtU5P03MGvsPT_21k-tjdrQpWk0tPHD9vUvHgGOLesal-mkkhLoQ3sorYMGjjNvcKwstQg7K4rpUO9vGqU" alt="compass needle" width="401" height="218">
Solution:
No, the compass needle does not show deflection when the circuit is closed, and the magnetic field is not created until the current is flowing through the circuit.
8. Fill in the blanks:
(a) Longer line in the symbol for a cell represents its ________ terminal.
(b) The combination of two or more cells is called a _________.
(c) When the current is switched &lsquo;on&rsquo; in a room heater, it _______.
(d) The safety device based on the heating effect of electric current is called a ______.
Solution:
(a) Longer line in the symbol for a cell represents its positive terminal.
(b) The combination of two or more cells is called a battery.
(c) When the current is switched &lsquo;on&rsquo; in a room heater, it produces heat.
(d) The safety device based on the heating effect of electric current is called a fuse.
9. Mark &lsquo;T&rsquo; if the statement is true and &lsquo;F&rsquo; if it is false:
(a) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. (T/F)
(b) When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. (T/F)
(c) An electromagnet does not attract a piece of iron. (T/F)
(d) An electric bell has an electromagnet. (T/F)
Solution:
a) False
b) True
c) False
d) True
10. Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.
Solution:
No, because plastic does not have the magnetic property to get attracted to a magnet; hence magnet cannot be used to separate plastic bags.
11. An electrician is carrying out some repairs in your house. He wants to replace a fuse with a piece of wire. Would you agree? Give reasons for your response.
Solution:
It is not a wise idea to replace the fuse with a piece of wire, as it has a very low melting point. In the case of the metal piece, the melting point will be high, and the circuit will be intact in case there is overload or overheating.
12. Zubeda made an electric circuit using a cell holder shown in Fig. 14.4, a switch and a bulb. When she put the switch in the &lsquo;ON&rsquo; position, the bulb did not glow. Help Zubeda to identify the possible defects in the circuit.
<img title="NCERT Solutions For Class 7 Science Chapter 14" src="https://lh7-us.googleusercontent.com/NyvvbpanI3nrG2j4PselTp5-_FScYQkNt8cfMqknimd6u5weRocH5YjO5TmKMKlnVRrGCgEj4P_eytUVPbdmQutp47uD4vkXRtiolU951-MEzgM0jB-EHdXLxABahjY7SWkeAcc10jMPnJQeoOppLHY" alt="incomplete circuit diagram" width="412" height="232">
Solution:
The reasons may be as follows:
i) The connecting wire may be loose
ii) The electric cell may be used up
iii) Switch may not be functioning well
iv) Cell power has been exhausted
13. In the circuit shown in Fig. 14.25
<img title="NCERT Solutions For Class 7 Science Chapter 14" src="https://lh7-us.googleusercontent.com/ZkH3WrBwBr73qwDQdLRee_ryg3eUSEt3rsZlBrCwzcm8hEwHbuzZ05rsEcolZNRLAtDO44cLye_n7ral-pLnQoMtKrIN2aj2-M40mTBwa_SEmvOEWVfPKDa4SoZIOm6Qgwey93IvNzI0g299uccJirA" alt="circuit diagram" width="415" height="223">
(i) Would any of the bulb glow when the switch is in the &lsquo;OFF&rsquo; position?
(ii) What will be the order in which the bulbs A, B and C will glow when the switch is moved to the &lsquo;ON&rsquo; position?
Solution:
i) No, the bulb will not glow as the circuit is not complete when the switch is off.
ii) If the switch is &lsquo;ON&rsquo;, all the bulbs glow simultaneously.
&nbsp;

Download Class 7 Science Chapter 14 Electric Current and Its Effects - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 14 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 14 Electric Current and Its Effects - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 15, "Light," are available right here. This chapter covers topics related to light and the reflection of light, offering students a comprehensive understanding of these concepts. To excel in Class 7 Science exams, it is highly recommended that students utilize NCERT Solutions for Class 7 Science. By working through the NCERT questions found at the end of each chapter, students can acquire a detailed and in-depth grasp of the subject matter. Here are some important topics covered in this chapter:

NCERT Solutions for Class 7 Science Chapter 15, "Light," are available right here. This chapter covers topics related to light and the reflection of light, offering students a comprehensive understanding of these concepts. To excel in Class 7 Science exams, it is highly recommended that students utilize NCERT Solutions for Class 7 Science. By working through the NCERT questions found at the end of each chapter, students can acquire a detailed and in-depth grasp of the subject matter. Here are some important topics covered in this chapter:
<ul>
<li dir="ltr" aria-level="1">
Light Travels along a Straight Line
</li>
<li dir="ltr" aria-level="1">
Reflection of Light
</li>
<li dir="ltr" aria-level="1">
Right or Left!
</li>
<li dir="ltr" aria-level="1">
Playing with Spherical Mirrors
</li>
<li dir="ltr" aria-level="1">
Images Formed by Lenses
</li>
<li dir="ltr" aria-level="1">
Sunlight &ndash; White or Coloured?
</li>
</ul>
These topics are fundamental for understanding the properties and behaviors of light. Students are encouraged to engage with the provided NCERT Solutions to enhance their comprehension of these concepts and perform well in their examinations.
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 15 Light Exercise Questions</h3>
1. Fill in the blanks.
(a) An image that cannot be obtained on a screen is called a ____________.
(b) Image formed by a convex __________ is always virtual and smaller in size.
(c) An image formed by a __________ mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a _________ image.
(e) An image formed by a concave ___________ cannot be obtained on a screen.
Solution:
(a) An image that cannot be obtained on a screen is called a virtual image.
(b) Image formed by a convex mirror is always virtual and smaller in size.
(c) An image formed by a plane mirror is always of the same size as that of the object.
(d) An image which can be obtained on a screen is called a real image.
(e) An image formed by a concave lens cannot be obtained on a screen.
2. Mark &lsquo;T&rsquo; if the statement is true and &lsquo;F&rsquo; if it is false.
(a) We can obtain an enlarged and erect image by a convex mirror. (T/F)
(b) A concave lens always form a virtual image. (T/F)
(c) We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)
(d) A real image cannot be obtained on a screen. (T/F)
(e) A concave mirror always forms a real image. (T/F)
Solution:
a) False
b) True
c) True
d) False
e) False
3. Match the items given in Column I with one or more items in Column II.
<div dir="ltr" align="left">
<table><colgroup><col width="163"><col width="425"></colgroup>
<tbody>
<tr>
<td>
Column-I
</td>
<td>
Column-II
</td>
</tr>
<tr>
<td>
(a) A plane mirror
</td>
<td>
(i) Used as a magnifying glass.
</td>
</tr>
<tr>
<td>
(b) A convex mirror
</td>
<td>
(ii) Can form images of objects spread over a large area.
</td>
</tr>
<tr>
<td>
(c) A convex lens
</td>
<td>
(iii) Used by dentists to see an enlarged image of teeth.
</td>
</tr>
<tr>
<td>
(d) A concave mirror
</td>
<td>
(iv) The image is always inverted and magnified.
</td>
</tr>
<tr>
<td>
(e) A concave lens
</td>
<td>
(v) The image is erect and of the same size as the object.
</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>
(vi) The image is erect and smaller in size than the object.
</td>
</tr>
</tbody>
</table>
</div>
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="161"><col width="427"></colgroup>
<tbody>
<tr>
<td>
Column-I
</td>
<td>
Column-II
</td>
</tr>
<tr>
<td>
(a) A plane mirror
</td>
<td>
(v) The image is erect and of the same size as the object.
</td>
</tr>
<tr>
<td>
(b) A convex mirror
</td>
<td>
(ii) Can form an image of objects spread over a large area.
</td>
</tr>
<tr>
<td>
(c) A convex lens
</td>
<td>
(i) Used as a magnifying glass.
</td>
</tr>
<tr>
<td>
(d) A concave mirror
</td>
<td>
(iii) Used by dentists to see an enlarged image of teeth.
</td>
</tr>
<tr>
<td>
(e) A concave lens
</td>
<td>
(vi) The image is erect and smaller in size than the object.
</td>
</tr>
</tbody>
</table>
</div>
4. State the characteristics of the image formed by a plane mirror.
Solution:
Characteristics of the image formed by a plane mirror are as follows:
<ul>
<li dir="ltr" aria-level="1">
Image distance and object distance are equal.
</li>
<li dir="ltr" aria-level="1">
The size of the object and image are equal.
</li>
<li dir="ltr" aria-level="1">
The image formed is erect and virtual.
</li>
<li dir="ltr" aria-level="1">
Images are laterally inverted.
</li>
</ul>
5. Find out the letters of the English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.
Solution:
A, H, I, M, O, T, U, V, W, X, and Y alphabets form images in a plane mirror exactly like the letter itself because these alphabets are laterally symmetric.
6. What is a virtual image? Give one situation where a virtual image is formed.
Solution:
The image that cannot be obtained on a screen is called a virtual image. The image formed by a plane mirror is virtual.
7. State two differences between a convex and a concave lens.
Solution:
<div dir="ltr" align="left">
<table><colgroup><col width="294"><col width="294"></colgroup>
<tbody>
<tr>
<td>
Convex Lens
</td>
<td>
Concave Lens
</td>
</tr>
<tr>
<td>
Thick in the middle and thin at the edge.
</td>
<td>
Thin in the middle and thick at the edge.
</td>
</tr>
<tr>
<td>
The image formed is real or virtual.
</td>
<td>
The image formed is virtual.
</td>
</tr>
</tbody>
</table>
</div>
8. Give one use each of a concave and a convex mirror.
Solution:
Concave mirrors are used in the headlights of cars and scooters.
Convex mirrors are used as side-view mirrors in vehicles.
9. Which type of mirror can form a real image?
Solution:
The concave mirror can form a real image.
10. Which type of lens always forms a virtual image?
Solution:
A concave lens forms a virtual image.
Choose the correct option in questions 11&ndash;13.
11. A virtual image larger than the object can be produced by a
(i) concave lens (ii) concave mirror
(iii) convex mirror (iv) plane mirror
Solution:
The correct answer is option (ii) concave mirror.
12. David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be
(i) 3 m (ii) 5 m
(iii) 6 m (iv) 8 m
Solution:
The answer is option (iii) 6 m
13. The rearview mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s. The driver sees in his rearview mirror the image of a truck parked behind his car. The speed at which the image of the truck appears to approach the driver will be
(i) 1 m/s (ii) 2 m/s
(iii) 4 m/s (iv) 8 m/s
Solution:
The correct answer is option (iii) 4 m/s.
&nbsp;

Download Class 7 Science Chapter 15 Light - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 15 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 15 Light - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 16, titled "Water: A Precious Resource," are invaluable study materials designed to help students achieve high marks in their examinations. These solutions offer comprehensive answers to all the questions found in the Class 7 Science NCERT textbooks and are expertly prepared to provide students with clarity and understanding.

NCERT Solutions for Class 7 Science Chapter 16, titled "Water: A Precious Resource," are invaluable study materials designed to help students achieve high marks in their examinations. These solutions offer comprehensive answers to all the questions found in the Class 7 Science NCERT textbooks and are expertly prepared to provide students with clarity and understanding.
At Orchids, we provide free chapter-wise NCERT Solutions for all classes, conveniently available in PDF format for easy download from our website. This chapter delves into a wide array of topics essential for students' future studies and overall knowledge. Some of the important topics covered include:
<ul>
<li dir="ltr" aria-level="1">
Assessing the availability of water
</li>
<li dir="ltr" aria-level="1">
Understanding the types of water sources
</li>
<li dir="ltr" aria-level="1">
Groundwater as a crucial water source
</li>
<li dir="ltr" aria-level="1">
The depletion of the water table
</li>
<li dir="ltr" aria-level="1">
Factors contributing to water scarcity
</li>
<li dir="ltr" aria-level="1">
The distribution of water resources
</li>
<li dir="ltr" aria-level="1">
The impact of increasing industries and agricultural activities on water
</li>
<li dir="ltr" aria-level="1">
Water management strategies
</li>
<li dir="ltr" aria-level="1">
Encouraging water-wise habits
</li>
<li dir="ltr" aria-level="1">
The role individuals can play in water conservation
</li>
<li dir="ltr" aria-level="1">
The effects of water scarcity on plant life
</li>
</ul>
Orchids is committed to providing comprehensive NCERT Solutions that enable effective learning and knowledge retention. Our teaching methodology, supported by innovative study materials, helps students grasp and remember these essential concepts.
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 16: Water: A Precious Resource Exercise Questions</h3>
1. Mark &lsquo;T&rsquo; if the statement is true and &lsquo;F&rsquo; if it is false.
(a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/F)
(b) Water shortage is a problem faced only by people living in rural areas. (T/F)
(c) Water from rivers is the only source of irrigation in the fields. (T/F)
(d) Rain is the ultimate source of water. (T/F)
Solution:
a) True
b) False
c) False
d) False
2. Explain how groundwater is recharged.
Solution:
The rainwater and water from other sources, such as rivers and ponds, seep through the soil and fill the empty spaces and cracks deep below the ground. The process of seeping water into the ground is called infiltration. The groundwater thus gets recharged by this process.
3. There are ten tube wells in a lane of fifty houses. What could be the long-term impact on the water table?
Solution:
If ten tube wells in a lane of fifty houses are situated, the groundwater will get used for domestic purposes. This results in the depletion of the groundwater level, and the water table goes down.
4. You have been asked to maintain a garden. How will you minimise the use of water?
Solution:
We can reduce the usage of water for gardening by adopting the drip irrigation method. In this method, water will reach the roots of the plant drop by drop, which will reduce the wastage of water.
5. Explain the factors responsible for the depletion of the water table.
Solution:
The factors responsible for the depletion of the water table are as follows:
Increase in population: Increase in population leads to increased demand for water for domestic and drinking purposes. This reduces the water table.
Industrialisation: Industries need a lot of water for manufacturing purposes. This reduces the water table.
Agriculture: Agriculture requires a lot of water for growing crops; this results in the depletion of the water table.
6. Fill in the blanks with the appropriate answers.
(a) People obtain groundwater through________ and ________.
(b) Three forms of water are ________, ________ and ________.
(c) The water-bearing layer of the earth is ________.
(d) The process of water seepage into the ground is called ________.
Solution:
(a) People obtain groundwater through tube wells and hand pumps.
(b) Three forms of water are ice, water and vapour.
(c) The water-bearing layer of the earth is Hydrosphere.
(d) The process of water seepage into the ground is called infiltration.
7. Which one of the following is not responsible for water shortage?
(i) Rapid growth of industries
(ii) Increasing population
(iii) Heavy rainfall
(iv) Mismanagement of water resources
Solution:
The answer is option (iii) Heavy rainfall.
8. Choose the correct option. The total water
(i) in the lakes and rivers of the world remains constant.
(ii) under the ground remains constant.
(iii) in the seas and oceans of the world remains constant.
(iv) of the world remains constant.
Solution:
The answer is option (iv) of the world remains constant.
9. Make a sketch showing the groundwater and water table. Label them.
Solution:
<img title="water table and ground water" src="https://lh7-us.googleusercontent.com/3MNS3tSURUiVEMV33F1XnyRlGc50yoazdf64in20bjHfF1f1QsMZW_f5rLjRWc1rT_2gx05_XX9c9iKecM7gNsUtKWkPCzte73D2NUCUaHAAYigX8Nmjx1VHzXXd3n76k5KDgWvv4eIo8__qg0kqf6M" alt="water table and ground water" width="624" height="291">
&nbsp;

Download Class 7 Science Chapter 16 Water: A Precious Resource - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 16 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 16 Water: A Precious Resource - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 17, titled "Forests: Our Lifeline," are presented as an engaging resource to help students comprehend the content of this chapter effectively. Expert teachers have crafted these solutions in a unique manner, making it easier for students to grasp the concepts and prepare for examinations.

NCERT Solutions for Class 7 Science Chapter 17, titled "Forests: Our Lifeline," are presented as an engaging resource to help students comprehend the content of this chapter effectively. Expert teachers have crafted these solutions in a unique manner, making it easier for students to grasp the concepts and prepare for examinations.
The NCERT Solutions for Chapter 17 enable students to become familiar with the examination pattern and the types of questions commonly asked.
"Forests: Our Lifeline" is a captivating chapter in Class 7 Science that delves into the significance of forests in our lives. Forests have been a source of numerous natural resources for centuries and have served as habitats for various species. These forests are integral to ecosystems, with each species playing a unique role.
Orchids is dedicated to providing comprehensive NCERT Solutions that facilitate interactive learning and enhance students' understanding of these essential concepts. Our educational approach and innovative study materials aim to ensure that students grasp and retain knowledge effectively.
&nbsp;
<h3 dir="ltr">NCERT Solutions Class 7 Science Chapter 17 Forests: Our lifeline Exercise Questions</h3>
1. Explain how animals dwelling in the forest help it grow and regenerate.
Solution:
Animals dwelling in the forest help it grow and regenerate in the following ways:
<ul>
<li dir="ltr" aria-level="1">
Animals help in dispersing plant seeds.
</li>
<li dir="ltr" aria-level="1">
Decaying animal dung provides nutrients for plants to grow
</li>
<li dir="ltr" aria-level="1">
Microorganisms convert the dead plants and animals to humus
</li>
</ul>
2. Explain how forests prevent floods.
Solution:
Plants in the forests will not allow the rainwater to fall directly on the earth, and these plants also hold water which helps in preventing floods.
3. What are decomposers? Name any two of them. What do they do in the forest?
Solution:
The micro-organisms which convert dead plants and animals to humus are known as decomposers. For example, bacteria and fungi. They help in the recycling of nutrients by decomposing dead plants and animals.
4. Explain the role of forests in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
Solution:
Plants in the forests consume carbon dioxide and release oxygen through the photosynthesis process. This helps in balancing oxygen and carbon dioxide in the atmosphere.
5. Explain why there is no waste in a forest.
Solution:
There is no waste in a forest because the waste created is bio-degradable, which gets converted to humus by the action of microorganisms.
6. List five products we get from forests.
Solution:
The five products we get from forests are listed below:
i) Medicines
ii) Spices
iii) Wood
iv) Paper
v) Gum
7. Fill in the blanks:
(a) The insects, butterflies, honeybees and birds help flowering plants in _______.
(b) A forest is a purifier of ________ and ________.
(c) Herbs form the ________ layer in the forest.
(d) The decaying leaves and animal droppings in a forest enrich the ________.
Solution:
(a) The insects, butterflies, honeybees and birds help flowering plants in pollination.
(b) A forest is a purifier of air and water.
(c) Herbs form the lowest layer in the forest.
(d) The decaying leaves and animal droppings in a forest enrich the soil.
8. Why should we worry about the conditions and issues related to forests far from us?
Solution:
We should worry about the forest for the following reasons:
<ul>
<li dir="ltr" aria-level="1">
A decrease in forests results in an increase in carbon dioxide content in the atmosphere. This results in global warming.
</li>
<li dir="ltr" aria-level="1">
Depletion of forests results in soil erosion
</li>
<li dir="ltr" aria-level="1">
The decrease in forests adversely affects the lives of animals living in the forest.
</li>
<li dir="ltr" aria-level="1">
The absence of forests leads to flooding more often.
</li>
<li dir="ltr" aria-level="1">
Due to the reduction of forests, the land will turn barren, which is called desertification.
</li>
</ul>
9. Explain why there is a need for a variety of animals and plants in a forest.
Solution:
A variety of plants and animals in the forests helps plants to regenerate and grow. A wide range of plants supports herbivores, which in turn serve as food for carnivores. Decomposers turn dead animals and plants into humus, thereby maintaining nutrient recycling. This wide variety makes the forest a dynamic living entity.
10. In Fig. 17.15, the artist has forgotten to put the labels and directions on the arrows. Mark the directions on the arrows and label the diagram using the following labels: clouds, rain, atmosphere, carbon dioxide, oxygen, plants, animals, soil, roots, and water table.
<img title="forests our lifeline" src="https://lh7-us.googleusercontent.com/aTRxrlXYc7oq_3bhjxTsOOKo3dUweJzDeMR8wRUpGJQvgzm-sRCEwbXhyRmbr9VD-Jq9KNTgqtHFNlrUpthKbCOfh3lx2z3wVSqDNCsO7CXgMn_WSvSWpR5LRjPP8wTwrnl9M1OvqgSH3RIc2141wDo" alt="forests our lifeline" width="341" height="544">
Solution:
<img title="forests our lifeline" src="https://lh7-us.googleusercontent.com/2pdVYgk4x3Vs6QCW2Ai-e8WcortNcqaBDuK0RYXfxCX7kVOtyH6eZ13Ank7xrRy3JR7yuqXk1n3RGrjtaGLHt8CxkqcIX8KtLv20kN0-Aq4rKQ8POe-uBk1jbCB4B6011gc93mJ_h3WPJ_eAjD9aK5g" alt="forests our lifeline" width="459" height="367">
11. Which of the following is not a forest product?
(i) Gum
(ii) Plywood
(iii) Sealing wax
(iv) Kerosene
Solution:
The answer is (iv) Kerosene
12. Which of the following statements is not correct?
(i) Forests protect the soil from erosion.
(ii) Plants and animals in a forest are not dependent on one another.
(iii) Forests influence the climate and water cycle.
(iv) Soil helps forests to grow and regenerate.
Solution:
Statement (ii) Plants and animals in a forest are not dependent on one another.
13. Micro-organisms act upon the dead plants to produce
(i) sand
(ii) mushrooms
(iii) humus
(iv) wood
Solution:
The answer is (iii) humus

Download Class 7 Science Chapter 17 Forests: Our Lifeline - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 17 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 17 Forests: Our Lifeline - Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science Chapter 18, titled "Wastewater Story," are invaluable for 7th-grade students. These solutions are designed to facilitate a clear and engaging understanding of the Wastewater Story. Subject experts have meticulously prepared and compiled these solutions in accordance with the latest CBSE syllabus (2023-2024). Regularly practicing these solutions is essential to prepare effectively for the examination.

NCERT Solutions for Class 7 Science Chapter 18, titled "Wastewater Story," are invaluable for 7th-grade students. These solutions are designed to facilitate a clear and engaging understanding of the Wastewater Story. Subject experts have meticulously prepared and compiled these solutions in accordance with the latest CBSE syllabus (2023-2024). Regularly practicing these solutions is essential to prepare effectively for the examination.
This chapter delves into the issue of water contamination, emphasizing the critical importance of water as a resource for all life on Earth. It underscores the consequences of water pollution, primarily driven by commercial and industrial activities. Industrial waste effluents that enter water bodies lead to water pollution, resulting in various diseases and health hazards.
For instance, in Minamata City, Japan, mercury runoff from a factory polluted the waters, leading to a public health crisis that went undetected for decades. Birth defects and health issues were prevalent among the inhabitants due to the contamination of the marine ecosystem, which affected fish species, and in turn, humans who consumed contaminated fish. Preventing industrial effluents from polluting our precious water resource is vital to avoid such severe consequences.
Key Topics Covered in NCERT Solution for Class 7 Science Chapter 18 "Wastewater Story" include:
<ul>
<li dir="ltr" aria-level="1">
Water our lifeline
</li>
<li dir="ltr" aria-level="1">
What is sewage
</li>
<li dir="ltr" aria-level="1">
Water freshens up-an eventful journey
</li>
<li dir="ltr" aria-level="1">
Wastewater treatment plant
</li>
<li dir="ltr" aria-level="1">
Better housekeeping practices
</li>
<li dir="ltr" aria-level="1">
Sanitation and diseases
</li>
<li dir="ltr" aria-level="1">
An alternative arrangement for sewage disposal
</li>
<li dir="ltr" aria-level="1">
Sanitation at public places
</li>
</ul>
Water is an indispensable resource used for various activities, and contaminating it can have detrimental effects on health. The primary source of water pollution is human activities linked to commercial and industrial endeavors, releasing toxic chemicals that disrupt aquatic ecosystems. Additionally, human excreta can pose a significant biohazard due to the presence of harmful microbes. These contaminants can infiltrate the aquatic environment, affecting all life forms.
NCERT Solutions Class 7 "Wastewater Story" educates students on proper waste segregation to reduce water pollution and raises awareness about sanitation. This chapter fosters a sense of responsibility for water conservation and environmental stewardship in students, helping them become conscientious citizens.
&nbsp;
<h3 dir="ltr">NCERT Solutions for Class 7 Science Chapter 18 &ndash; Wastewater Story Exercise Questions</h3>
1. Fill in the blanks:
(a) Cleaning of water is a process of removing ____________.
(b) Wastewater released by houses is called ____________.
(c) Dried ____________ is used as manure.
(d) Drains get blocked by ____________ and ____________.
Solution:
(a) Cleaning of water is a process of removing pollutants.
(b) Wastewater released by houses is called sewage.
(c) Dried sludge is used as manure.
(d) Drains get blocked by cooking oil and fats.
2. What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.
Wastewater released by houses is called sewage. Untreated sewage should not be discharged into the sea because sewage consists of pollutants and harmful microorganisms, which will contaminate water, causing disease in people using contaminated water.
3. Why should oils and fats not be released in the drain? Explain.
Solution:
Oils and fats should not be released into the drain because drains get blocked by cooking oil and fats.
4. Describe the steps involved in getting clarified water from wastewater.
Solution:
Use an aerator from an aquarium to bubble air through the sample in the glass jar. Allow several hours for aeration; leave the aerator attached overnight. If you do not have an aerator, use a mechanical stirrer or a mixer. This reduces the foul smell of wastewater.
Then, the water is filtered through the layers of sand, fine gravel and medium gravel. Filtration makes the wastewater clean from various types of pollutants. The water is filtered continuously until it becomes clear.
Water is disinfected by using a chlorine tablet.
5. What is sludge? Explain how it is treated.
Solution:
Solids like faeces settle at the bottom while treating sewage, and this material is called sludge. Sludge can be treated as follows:
Sludge is removed using a skimmer and then transferred to a tank where it is decomposed by anaerobic bacteria to produce biogas.
6. Untreated human excreta is a health hazard. Explain.
Solution:
Untreated human excreta is a health hazard because it consists of various disease-causing microorganisms and pollutants that will contaminate the soil and water resource from where people draw water for drinking and domestic purposes. When people use water contaminated with human excreta, they get diseases like Cholera, Typhoid, Dysentry and Hepatitis.
7. Name two chemicals used to disinfect water.
Solution:
Chlorine and Ozone are used to disinfect water.
8. Explain the function of bar screens in a wastewater treatment plant.
Solution:
Bar screens remove large objects like rags, sticks, cans, plastic packets and napkins.
9. Explain the relationship between sanitation and disease.
Solution:
Sanitation and disease are interrelated as lack of sanitation leads to illness, and good sanitation practices prevent diseases.
10. Outline your role as an active citizen in relation to sanitation.
Solution:
Every citizen has a role to play in maintaining proper sanitisation. Following are the things we should follow to play an active role.
<ul>
<li dir="ltr" aria-level="1">
Ensure that our surroundings are kept clean.
</li>
<li dir="ltr" aria-level="1">
The sewage system in the house should be properly managed
</li>
<li dir="ltr" aria-level="1">
Report to the concerned authorities immediately in case of leakages in sewage pipes.
</li>
</ul>
11. Here is a crossword puzzle: Good luck!
<img title="Puzzles on waste water story" src="https://lh7-us.googleusercontent.com/FnN7fbL5dR544c5ZOAKIjSEYs4JhFNetJUwcryPK-Q0gIBjUuBSZ33CJYyPjwWQqe96X6IlUCoNCq_ZDAMXHht2o_v-V4i6Zug7E8QQNypgJAjeQc-BJQJzq2BW6-KOISaTLSCl9XsfVOiWQoJnQVp8" alt="Puzzles on waste water story" width="565" height="475">
Across
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human body
Down
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which causes cholera
7. A chemical to disinfect water
Solution:
Across
3. Sewage
4. Sludge
6. Sanitation
8. Excreta
Down
1. Wastewater
2. Sewer
5. Bacteria
7. Ozone
<img title="Puzzles on waste water story" src="https://lh7-us.googleusercontent.com/jEg54xbTW7ScdUoViEhtDABBOZiGD6w2k5THJPPL0kCDDiwW-UM2ZPHiIq-Am7xwFU7owoFi-p_S8KKuXDDWgkIFamrdpenYEFFwCaOxf33KtfQRJfI9NKVCGmgddHzdffONp_PSanALm70BXeyLA24" alt="Puzzles on waste water story" width="624" height="521"> 12. Study the following statements about ozone:
(a) It is essential for breathing of living organisms.
(b) It is used to disinfect water.
(c) It absorbs ultraviolet rays.
(d) Its proportion in air is about 3%. Which of these statements are correct?
(i) (a), (b) and (c)
(ii) (b) and (c)
(iii) (a) and (d)
(iv) All four
Solution:
The answer is (ii) (b) and (c)
&nbsp;

Download Class 7 Science Chapter 18 Wastewater Story - In the Earliest Cities NCERT Solutions in PDF format. Explore NCERT Solutions for Class 7 Science Chapter 18 with detailed explanations for a comprehensive understanding.

NCERT Solutions for Class 7 Science - Chapter 18 Wastewater Story - Free PDF Download | ORCHIDS

<h5 dir="ltr">NCERT Solutions for Class 7 Science</h5>
NCERT Solutions for Class 7 Science serve as an invaluable resource to prepare for examinations. These solutions, designed in accordance with NCERT guidelines, are crafted by expert teachers. They offer clear and comprehensive answers to key questions from NCERT textbooks, making complex concepts easier to understand.
With these solutions at your disposal, you can enhance your exam preparation and achieve high scores. They provide a foundation of knowledge that's not just crucial for exams but also for fostering a deep understanding of various scientific topics.
Covering chapters in Physics, Chemistry, and Biology, Class 7 Science plays a pivotal role in building the fundamental principles of science. Each chapter's exercises and questions are addressed in a student-friendly manner. The responses not only provide insights but also spark interest in the subject.
These NCERT 7 Science solutions are easily accessible, ensuring that you have a dependable resource at your fingertips. The content is meticulously crafted from the NCERT textbook, ensuring that it remains free of extraneous or superfluous material.
&nbsp;

Enhance your Class 7 Science studies with free PDF downloads of NCERT Solutions. Dive into expert-crafted answers for subjects like Maths, Science, Social Science, English, and Hindi. Elevate your academic journey with ORCHIDS' comprehensive resources!

NCERT Solutions for Class 7 - Science- Free PDF Download | ORCHIDS

NCERT Solutions for Class 7 Science serve as an invaluable resource to prepare for examinations. These solutions, designed in accordance with NCERT guidelines, are crafted by expert teachers. They offer clear and comprehensive answers to key questions from NCERT textbooks, making complex concepts easier to understand.

Class 7: NCERT Solutions for Science Subject

NCERT Solutions for Class 7 Science

Chapters