Water Pollution · NCERT Biology

High concentrations of DDT in birds interfere with calcium metabolism, leading to:

  1. Decline in bird population from thinning of eggshells
  2. Formation of thicker eggshells and delayed hatching
  3. Increased appetite and metabolic rate
  4. Immediate death of the adult birds
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Correct answer: Decline in bird population from thinning of eggshells

DDT disrupts calcium deposition during eggshell formation in birds. This results in thin shells that break prematurely during incubation, ultimately leading to a decline in the bird population.

Difficulty: Medium Question 6 of 20

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