A high BOD value in aquatic environment indicates

A pollution free system

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A highly polluted system due to excess of nutrients

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A highly polluted system due to abundant heterotrophs

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A highly pure water with abundance of autotrophs

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Solution

The correct option is B
A highly polluted system due to excess of nutrients

Biochemical oxygen demand(BOD) is the amount of dissolved oxygenneeded by aerobic biological organisms in a water body to break down organic materials present in a given water sample at certain temperature over a specific time period. It is widely used as an indication of the organic quality of water.

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