Answer :

(a) Plants satisfy man's basic needs for food, shelter and clothing.


Without soil, plants cannot grow. Plants provide food and shelter for animals including humans.


(b) plants and animals are the organic constituents of soil.


Soil contains organic substances which are either comes from plants or from animals.


i. The organic substances coming from plants are called soil constituents of plant origin.


ii. The soil constituents of plant origin include bacteria, fungi, and algae, blue - green algae, decomposed leaves, etc., of plants.


iii. The soil constituents of plant origin include insects, protozoa, worms, shells and decomposed remains of dead animals.


(c) Land should be covered to prevent erosion.


Land without vegetation (plants) covering leads to soil erosion.


(d) Disturbance of the natural balance of soil is called soil pollution.


Farmers use chemical fertilisers and pesticides in the crop fields in greater quantities than they required then the proportion of chemicals in the soil increases. These chemical disturb the soil natural balance causing soil pollution.


(e) The government has started the social forestry project to protect forests.


Social forestry project started by government of India to encourage small/ poor farmers and adivasis to plant trees and do agriculture activity on the fallow (empty) and barren land and draws some income by selling wood and other forest products.


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