First slide

Water Pollution and its Control

Question

Eutrophic lakes are

Easy

A

nutrient rich ; oxygen rich.
B

nutrient poor ; oxygen rich.
C

nutrient poor ; oxygen poor.
D

nutrient rich ; oxygen poor.

Solution

Eutrophication of a lake is aging of the lake due to the deposition of plant nutrients. So it is rich in nutrients.
But such a lake will have microbes that act on organic nutrients and consume oxygen in the process. So it is depleted of oxygen.

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