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

1. drying of the river very soon due to algal bloom.
2. increased population of aquatic food web organisms.
3. an increased production of fish due to biodegradable nutrients.
4. death of fish due to lack of oxygen.

Correct answer: death of fish due to lack of oxygen.

Solution

Domestic sewage rich in organic waste leads to eutrophication, causing algal blooms. These blooms deplete oxygen levels in the water, leading to hypoxia and the death of fish and other aquatic organisms.

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