Question

Biomagnification of DDT causes decline in bird population by

• A. Disturbing Ca metabolism
• B. Premature breaking of egg shells
• C. Thinning of eggshells
• D. All the above

Answer 1

The correct option is D All the above

Effect of DDT on birds

DDT was used as insecticide in agriculture and released in water bodies, so it gets accumulated in fishes as well as the birds feeding on these fishes. This accumulation of DDT causes the following:

• Infertility
• Disturbance in calcium metabolism
• Thinning and premature breaking of eggshells

Eventually, these resulted in decline in the bird population feeding on fishes.

$\text{Final answer}$

(d) All the above