Which one of the following is not correct with regard to DDT?

Bacteria can undergo multiplication and DDT is degraded by living cells

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Bacteria can be degraded by living cells and DDT cannot be degraded by living cells

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Bacteria can undergo biological magnification and DDT can be degraded by living cells

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bacteria can undergo biological magnification and DDT cannot be degraded by living cells

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Solution

The correct option is A Bacteria can undergo multiplication and DDT is degraded by living cells
Biomagnification is the process by which toxic substances which cannot be metabolised by the body, start becoming more and more concentrated at successive trophic levels. DDT was once, used extensively as a pesticide and was sprayed on crops to kill insects. However, it has been noticed that through run off from fields, DDT enters streams and lakes, and enters the food chain of aquatic plants and animals. Because DDT is non-biodegradable, it keeps accumulating at toxic levels in living bodies.

Suggest Corrections

	Biodegradable pollutants	Non-biodegradable pollutants
(i)	These are the pollutants that can be easily degraded by micro-organisms.	These are the pollutants that can not be degraded into harmless materials.
(ii)	These can be used to produce energy (through biogas), compost, manure, etc.	These are difficult to manage as a natural method of degradation is absent.
(iii)	These usually do not enter biogeochemical cycles.	These become a part of rapid turnover in biogeochemical cycles.
(iv)	Examples: DDT, BHC, plastics, polyethylene, glass, etc.	Examples: Sewage, garbage, animal waste, etc.