Answer :

a) Pesticides enter the Phytoplankton from the polluted water. This level of organism is known as producers. They produce their own food through the process of photosynthesis.


b) Birds will have the maximum amount of pesticides accumulated through the food chain because they are at the top in the food chain.


The process of accumulation of substances like pesticides where they move up the food chain, enter the aquatic organisms which are in turn are eaten by birds or humans is known as biological magnification.


c) Food chain= Phytoplankton-Larvae-Fish-Birds.


d) Human being can be considered in place of birds in the above food chain since they are omnivore too like certain birds; they eat food both of plant and animal origin.


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