Question

DDT was sprayed in a lake to regulate breeding of mosquitoes. How would it affect the trophic levels in the following food chain associated with a lake? Justify your answer.

 

Answer 1

• DDT being a non- biodegradable pesticide will enter the food chain from the first trophic level i.e Plankton.
• Non – biodegradable pesticides accumulate progressively at each trophic level. This phenomenon is known as biological magnification.
• HAWK will have the highest level of pesticide.