First slide

Water Pollution and its Control

Question

Often in the water bodies subjected to sewage pollution, fishes die because of the

Easy

A

foul smell
B

pathogens in the sewage
C

clogging of their gills by solid particles
D

reduction is dissolved oxygen caused by microbial activity

Solution

Micro-organisms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen, and as a result there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. This causes mortality of fish and other aquatic creatures.

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