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Effect of Sewage on Water Bodies

Question

When domestic sewage mixes with river water
The river water is still suitable for drinking as impurities are only about 0.1%.
Small animals like rats will die after drinking river water.
The increased microbial activity uses up dissolved oxygen.
The increased microbial activity releases micronutrients such as iron.

A

The river water is still suitable for drinking as impurities are only about 0.1%.

B

Small animals like rats will die after drinking river water.

C

The increased microbial activity releases micronutrients such as iron.

D

The increased microbial activity uses up dissolved oxygen.

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Solution

Verified by Toppr

When domestic sewage mixes with river water, the microbes present in water starts to degrade it and increased microbial activity increases the biological oxygen demand of the water and so as the percentage of dissolved oxygen decreases it leads to the death of aquatic life.
So, the correct answer is option D.

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