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NCERT Solutions for Class 7 Science Chapter 16: Water: A Precious Resource Exercise Questions

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.

Water: A Precious Resource

Question 1 :

Explain how groundwater is recharged.

 

Answer :

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.

 


Question 2 :

There are ten tube wells in a lane of fifty houses. What could be the long-term impact on the water table?

 

Answer :

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.

 


Question 3 :

You have been asked to maintain a garden. How will you minimise the use of water?

 

Answer :

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.

 


Question 4 :

 Explain the factors responsible for the depletion of the water table.

 

Answer :

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.

 


Question 5 :

Mark ‘T’ if the statement is true and ‘F’ 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)

 

Answer :

a) True

 

b) False

 

c) False

 

d) False

 


Question 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 ________.

 

Answer :

(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.

 


Question 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

 

Answer :

(iii) Heavy rainfall.


Question 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.

 

Answer :

(iv) of the world remains constant.

 


Question 9 :

Make a sketch showing the groundwater and water table. Label them.

 

Answer :

water table and ground water

 


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