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The increase in the concentration of DDT in organisms at successively higher trophic levels of a food chain is called:

  1. Aeutrophication
  2. Bthermal stratification
  3. Cphotochemical smog formation
  4. Dbiomagnification

Answer: D

DDT is fat soluble and not metabolised, so it is retained and its concentration rises at each trophic level. This is biomagnification.
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