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Question

Which one of the following is not correct about DDT?


  1. Bacteria can undergo biological magnification and DDT can be degraded by living cells
  2. Bacteria can be degraded by living cells and DDT cannot be degraded by living cells
  3. Bacteria can undergo multiplication and DDT is degraded by living cells
  4. bacteria can undergo biological magnification and DDT cannot be degraded by living cells


Solution

The correct option is C 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.

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