The highest DDT concentration in aquatic food chain shall occur in

eel

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phytoplankton

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seagull

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crab

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Solution

The correct option is C seagull
DDT is a toxic substance which gets concentrated subsequently in a food chain of an aquatic ecosystem in the following manner.

Phytoplanktons-> Eel-> Crab -> Seagull

Thus, the animal or organism acquiring the highest position in a food chain would have the highest DDT concentration (here seagull). This process is known as biological magnification or biomagnification.

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