NEET Previous Year Question
When domestic sewage mixes with river water
Topic: NEET PYQ
Answer: C. Full step-by-step solution below.
- ASmall animals like rats will die after drinking river water.
- BThe increased microbial activity releases micronutrients such as iron.
- CThe increased microbial activity uses up dissolved oxygen.
- DThe river water is still suitable for drinking as impurities are only about 0.1 per cent
Correct answer: C
Solution
(c) When domestic sewage mixes with river water, the organic matter increases microbial growth. These microbes consume a large amount of dissolved oxygen (DO) for decomposition, which can lead to oxygen depletion and harm aquatic life.More Microbes in Human Welfare PYQs
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