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In an area where DDT had been used extensively, the population of birds declined significantly because:

  1. A
    Many of the birds eggs laid did not hatch
  2. B
    Birds stopped laying eggs
  3. C
    Earthworms in the area got eradicated
  4. D
    Cobras were feeding exclusively on birds

Solution & Step-by-step Explanation

DDT undergoes biomagnification in the food chain. High concentrations of DDT in birds disturb calcium metabolism, which causes thinning of eggshells and their premature breaking. This eventually leads to a decline in the bird population as eggs fail to hatch.

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In an area where DDT had been used extensively, the population of birds declined significantly because:
A
Many of the birds eggs laid did not hatch
B
Birds stopped laying eggs
C
Earthworms in the area got eradicated
D
Cobras were feeding exclusively on birds

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Environmental IssuesBiomagnification

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