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Q.
Assertion : Presence of large amounts of nutrients in water body causes excessive growth of planktonic algae. Reason : It is due to biomagnification.
Presence of large amounts of nutrients in water causes excessive growth of planktonic (free-floating) algae, called an algal bloom which imparts a distinct colour to the water bodies. Algal blooms cause deterioration of the water quality and fish mortality. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels.