What is NOT true about BOD?

It is a result of a biological process

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Polluted water has high BOD

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River at its source has high BOD

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Oxygen is required for the degradation of organic matter

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Solution

The correct option is C
River at its source has high BOD

Biochemical oxygen demand (BOD, also called biological oxygen demand) is the amount of dissolved oxygen needed (i.e. demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.

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