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🩺 NEET🧬 Biology

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

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A river with an inflow of domestic sewage rich in organic waste may result in:
aIncreased population of aquatic food web organisms
bAn increased production of fish due to biodegradable nutrients
cDeath of fish due to lack of oxygen
dDrying of the river very soon due to algal bloom
✓ Correct answer: c) Death of fish due to lack of oxygen
ExplanationWhen domestic sewage rich in organic waste enters a river, it increases the biochemical oxygen demand (BOD) due to microbial decomposition.This leads to oxygen depletion in water, thus causing the death of fish and other aquatic organisms due to a lack of dissolved oxygen.Hence, the correct answer is option C.
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