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BOD (Biochemical Oxygen Demand) refers to

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amount of oxygen consumed for the oxidation of all organic matter present in one liter of water.

amount of oxygen released during the degradation of organic matter present in one liter of water.

amount of oxygen needed for the survival of microfauna present in one liter of water

amount of oxygen needed for the respiration of heterotrophic microscopic organisms present in one liter of water.

answer is A.

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Detailed Solution

Biochemical Oxygen Demand is defined as amount of oxygen consumed for the oxidation of all the organic matter present in one liter of water by bacteria or aerobic microbes.

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