Question

In an agricultural farm, DDT was used to kill insects. Unfortunately, the amount of DDT used was very high and when there was rainfall, it was taken to the nearby lake along with the rainwater and got accumulated there. Given below is a food chain operating in this lake ecosystem:
Phytoplankton $\to$ zooplankton $\to$ fish $\to$ aquatic bird

In which organism's body the concentration of DDT will be highest?

• A. Phytoplankton
• B. Zooplankton
• C. Fish
• D. Aquatic bird

Answer 1

The correct option is D

Aquatic bird

Non-biodegradable pollutants like DDT can enter the food chain where at each trophic level their concentration keeps increasing. This phenomenon is called biomagnification. In the given food chain aquatic birds are at the top trophic level. Hence, DDT concentration will be highest in them.