Biological Oxygen Demand (BOD) is

Directly related to dissolved oxygen (DO)

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The amount of oxygen required by the anaerobic microorganisms to metabolise all the organic waste present in 1 L of water

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The amount of oxygen required by the aerobic microorganisms to metabolise all the inorganic waste present in 1 L of water

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The amount of oxygen required by the aerobic microorganism to metabolise all the organic waste present in 1 L of water

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Solution

The correct option is D The amount of oxygen required by the aerobic microorganism to metabolise all the organic waste present in 1 L of water
Biochemical oxygen demand (BOD) is the amount of dissolved oxygen (DO) required by aerobic microorganisms to break down organic material present in a given water sample at a certain temperature over a specific time period. The BOD value is most commonly expressed in milligrams of oxygen consumed per litre of sample during 5 days of incubation at 20 °C and is often used to measure the degree of organic pollution of water.

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