Which of the following has highest level of DDT in an aquatic food chain?

Duck

The correct answer is Option (3) -Duck

The term biomagnification refers to the increase in concentration of a non-degradable pollutant through a food chain. This happens because the pollutant is not broken down by the organisms in the food chain, and it accumulates in the tissues of the organisms at higher and higher levels as it moves up the food chain.example :

When an organism, such as a phytoplankton, consumes a pollutant, such as DDT, the pollutant is stored in the phytoplankton's tissues. When a larger organism, such as a fish, consumes the phytoplankton, the pollutant is transferred to the fish's tissues. The concentration of the pollutant in the fish's tissues is now higher than it was in the phytoplankton's tissues. When a larger organism, such as a bird, consumes the fish, the pollutant is transferred to the bird's tissues. The concentration of the pollutant in the bird's tissues is now even higher than it was in the fish's tissues.