Q54 of 56 Page 84

Justify “Dust is a pollutant” ?

Dust remains present in air as suspended particles can cause allergy and other respiratory diseases. It also affects plant growth, by covering stomata on leaf surface. It acts as the carrier of toxic compounds like heavy metals.


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52

What are the causes of water pollution? Discuss how you can contribute in reducing water pollution.

 53

A motor car, with its glass totally closed, is parked directly under the sun.

 55

Explain the role of the Sun in the formation of soil.

 56

Carbon dioxide is necessary for plants. Why do we consider it as a pollutant?