Question

Which of the following exhibits biomagnification?

Options

• SO₂

• CO₂

• Methane

• DDT

Answer 1

DDT

Explanation:

DDT exhibits biomagnification, which means that its concentration increases at successive trophic levels in the aquatic food chain. Starting from a very low concentration in water, it accumulates progressively higher in planktons, small fish, larger fish, and finally at the top carnivores such as fish-eating birds. This buildup can reach extremely high levels, causing harmful effects such as thinning of eggshells and population decline in birds. Sulfur dioxide (SO₂), carbon dioxide (CO₂), and methane do not exhibit biomagnification.