First slide

Water Pollution and its Control

Question

A river with an inflow of domestic sewage rich in organic waste may result in

Moderate

A

an increased production of fish due to biodegradable nutrients
B

death of fish due to lack of oxygen
C

drying of the river very soon due to algal bloom
D

increased population of aquatic food web organisms.

Solution

A river with an inflow of domestic sewage rich in organic waste may result in the death of fish due to a lack of oxygen.
Following the discharge of sewage into a river, micro-organisms involved in the 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 the mortality of fish and other aquatic creatures.

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