3rd Class Science Living and Non-living Things Sources of food for Plants and Animals

    Source of Food for Plant and Animal

Food is essential because it gives energy for growth and to do various activities of day to day life. Plants prepare its own food with the help of water, carbon dioxide and sunlight. Leaves of plant are green in colour because of the presence of chlorophyll. Plants prepare food for itself by trapping sun's light in the presence of water and carbon dioxide. Plants need little amount of food prepared by them for immediate consumption, remaining food is stored in other parts of plants like root, stem etc. Animals are dependent on plants for their food. Animals also eat the flesh of other animals. Hence animals are directly or indirectly dependent on plants. The process of food obtained by living things is best described by a chain called food chain.

Look at the following picture of the process of photosynthesis:

Look at the following picture of food chain:

     Which one of the following performs photosynthesis?

(a) Green Plants

(b) Elephants

(c) Sun

(d) All of these

(e) None of these

Answer: (a)

Explanation

All the green plants make their food by photosynthesis. Therefore, option (a) is correct and rest of the options is incorrect.

    Leaves of plant are green in color because of _____?

(a) Carbon dioxide

(b) Oxygen

(c) Chlorophyll

(d) All of these

(e) None of these

Answer: (c)

Explanation

Leaves of plant are green because of the presence of Chlorophyll. Therefore, option (c) is correct and rest of the options is incorrect.