Question

Multiple Choice Questions
In an area where DDT had been used extensively, the bird population declined significantly due to

• A. Birds stopped laying eggs
• B. earthworms disappeared from the area
• C. many of the birds eggs did not hatch
• D. snakes started feeding exclusively on birds.

Answer 1

Answer: (C)

many of the birds eggs did not hatch

For an area where DDT had been used extensively, there's a likelihood of its biomagnification. Biomagnification refers to an increase in concentration of toxic substances due to its accumulation at successive trophic levels. Biomagnification of DDT disturbs calcium metabolism in birds leading to thinning of eggshells and its premature breaking or underdevelopment ceasing its hatching. This leads to a significant decrease in their population.

So, the correct answer is option C, many of the birds eggs did not hatch.