A) Sewage
B) Sulphur dioxide
C) Oxides of nitrogen
D) Lead vapour
Correct Answer: D
Solution :
:There are two main classes of pollutants: those that are biodegradable (e.g., sewage), i.e., can be rendered harmless by natural processes and therefore cause no permanent harm if adequately dispersed or treated; and those that ire nonbiodegradable e.g., heavy metals (such as lead) in industrial effluents and DDT and other chlorinated hydrocarbons used as pesticides, which eventually accumulate in the environment and may be concentrated in food chains.
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