Q21 of 54 Page 350

Explain why, hot water released by power plants and industries is considered a pollutant.

Some industries and power plants releases hot water into the rivers. Hot water can also be considered as a pollutant. It raises the temperature of the water body and adversely affects the plants and animals living in it.

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19

Name one source and one harmful effect of each of the following air pollutants:

(a) Sulphur dioxide


(b) Nitrogen oxides


(c) Carbon monoxide


(d) Chlorofluorocarbons (CFCs)

 20

Explain why, even clear, transparent and odourless water may not always be safe for drinking.

 22

Why does the increased level of nutrients (or fertilizers) in the lake water affect the survival of aquatic organisms (like fish)?

 23

Explain how, the use of pesticides in agriculture causes water pollution.