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

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an increased production of fish due to biodegradable nutrients

death of fish due to lack of oxygen

drying of the river very soon due to algal bloom

increased population of aquatic food web organisms.

answer is B.

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Detailed 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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