Q78) A high Biological Oxygen Demand indicates

a) that the water is pure

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b) the absence of microbial action

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c) low level of microbial pollution

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d) high level of microbial pollution

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Solution

The correct option is D d) high level of microbial pollution
D)
Explanation:

Biochemical oxygen demand is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.A high Biological Oxygen Demand indicates high level of microbial pollution.

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