Question #0fac6

1 Answer
Jun 24, 2017
  • The DDT in fish eating bird is calculated as :

Explanation:

  • Biomagnification is refer to the increase in concentration of the toxicant substances present in industrial waste waters at successive trophic level in aquatic food chain.

  • Because when a toxic substance accumulated by an organism at lower trophic level , it cannot be metabolised or excreted and is passed on to the next higher trophic levels of the food chain.

  • Hence , the concentration of DDT goes on increasing as passed to higher trophic level.

  • The higher concentration of DDT disturbs:

  • Calcium metabolism in birds

  • Thinning of eggshell

  • Premature breaking

  • Decline in bird population
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