First slide

Water Pollution and its Control

Question

Fishes die by sewage because

Easy

A

of its bad smell
B

it replaces food material of fishes
C

it increases oxygen competition among fishes
D

CO₂ is mixed in large amounts in water

Solution

Sewage is a waste material (such as human urine and faeces) that is carried away from homes and other buildings in a system of pipes. Fishes die by sewage due to increase oxygen competition among them which leads to suffocation from low levels of dissolved oxygen in the water.

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