Question

discuss the importance of photosynthesis in following ways
1. green plants prepare own food
2. source of energy
3. purify air​

Answer 1

Answer:

Green plants make their food themselves. Green leaves make food from Carbon dioxide and water in the presence of sunlight and chlorophyll.

Leaves have several tiny pore-like structures on the lower surface. Such a pore is called stomata through which leaves absorb carbon dioxide from air. Water is transported to the leaves through hair like pipelines from the roots. These pipelines are present throughout the plant, i.e. from roots to branches and leaves. These pipe-lines are known as Xylem. Xylem is a type of tissue. Chlorophyll, a green pigment, is found in green leaves. Chlorophyll absorbs sunlight and gives energy. Chloroplast is the site of photosynthesis. Carbohydrate is used as food and oxygen is emitted out to atmosphere. This whole process of making food by plants is called photosynthesis.

The reaction that takes place in the process of photosynthesis can be written as:

6CO2 + 6H2O → C6H12O6 + 6O2

Carbohydrate which is produced in the process of photosynthesis is ultimately converted into starch and stored in leaves. From leaves it is transported to different parts of a plant. Starch is a type of carbohydrate. The oxygen so produced is released into atmosphere through the stomata.

Leaves are known as the kitchen or food factories of the plants because photosynthesis takes place in leaves. Leaves look green because of the presence of chlorophyll.

Besides leaves, photosynthesis also takes place in other green parts of the plant also, such as in green stems. Chlorophyll is necessary for photosynthesis; hence photosynthesis takes place only in green plants.

Explanation: