Question

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

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

Answer 1

The correct option is B

Many of the birds' eggs laid did not hatch

High concentration of DDT disturbs calcium metabolism in birds which caused thinning of eggshell and their premature breaking.