Different Parts of Leaf: Anatomy, Description, Functions and Significance

A leaf is like a small food factory in a plant that produces food by taking sunlight, water and carbon dioxide from the air. They are an important part of the plant playing a crucial role in generating energy that gets exchanged through different levels in the food chain. Here we have explained some interesting facts about different parts of the leaf for kids, along with how they prepare food for plants and other important functions.

Table of Contents

• Structure of Leaf
• Part of Leaf
• What is Photosynthesis
• Functions of Leaves in Plant Life

Structure of Leaf

A leaf is protected by a waxy cuticle that prevents the essential water inside it from evaporating. Beneath this waxy layer is the upper epidermis that is completely transparent and allows sunlight to pass inside the leaf. Mesophyll is the tissue layer inside the leaf where plants prepare their food. Inside this layer there is stomata that regulates the gases entering and exiting the leaf such as carbon dioxide from the atmosphere enters into the leaf and oxygen gets released through it by stomata. The chloroplast inside the mesophyll cells is the exact place where photosynthesis occurs. It contains the chemical called chlorophyll that picks the solar radiation. 

Stomata: These tiny pores on the leaf are responsible for absorbing carbon dioxide and releasing oxygen in the atmosphere. They also play an important role in preparing food for the plant. It also helps in evaporation of water required for carrying water and minerals from the roots of the plant to other parts.

Chlorophyll: Chlorophyll is a green colour pigment in plants that uses solar energy to split water molecules apart to release the electrons required for turning carbon dioxide into food. This process is called photosynthesis.

What is Photosynthesis 

Leaves are the food stores of plants that use carbon dioxide, water and sunlight to prepare sugar. This process of preparation of food is called photosynthesis. Plants absorb water from ground through roots and carbon dioxide through stomata in leaves. Leaves then turn the carbon dioxide into sugar with the help of sunlight inside chloroplasts. The other parts of the leaf then supply this food to the rest of the parts of a plant. Let’s learn about each part of a leaf and their function inside a plant.

Parts of a Leaf 

Petiole: It is like the backbone of the leaf that holds it and connects it to the stem. Petiole helps the leaf get food and water from the plant.

Midrib: It is the part of the leaf that runs down the center of the leaf and gives the leaf its structure.

Vein: A vein carries water and nutrients all around the leaf just like our veins. They make sure the leaf stays green by getting all the nutrients and water.

Lamina or blades: The flat part of a leaf is called lamina or blade. It acts like the solar panel of the leaf to catch sunlight and prepare food through photosynthesis.

Tip or Apex: The point on the end of the leaf is called its tip or apex.

Stipules: This is a small leaf-like growth at the end of a leaf. It attaches a leaf to the stem.

Functions of Leaves in Plant Life

There are some primary functions that leaves perform in a plant for example, photosynthesis and transpiration. Depending on the environment, leaves adapt and some other functions such as storing water, growing thorns and more. Below are some major functions leaves perform in a plant:

Photosynthesis: The most important function of leaves in plant life is creating food. Plants get their energy from sugar created by leaves through photosynthesis.

Exchanging Gases: Leaves absorb and release gases in the atmosphere with the help of tiny pores called stomata. The carbon dioxide inhaled by the leaves is used for food preparation in plants.

Transpiration: Leaves allow water inside them to evaporate to create a vacuum that transports water and nutrients from roots to the rest of the plant.

Storing Water: Leaves of some plants like cactus retain water to survive in arid environments like desserts.