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(A) The $BOD$ (Biochemical Oxygen Demand) is a measure of the amount of dissolved oxygen required by aerobic microorganisms to decompose the organic m

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Increase

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(A) The $BOD$ (Biochemical Oxygen Demand) is a measure of the amount of dissolved oxygen required by aerobic microorganisms to decompose the organic matter present in a given volume of water.When a large amount of sewage is dumped into a river,it introduces a significant quantity of organic matter.Microorganisms consume this organic matter,which leads to an increase in their metabolic activity and oxygen consumption.Therefore,the $BOD$ of the water increases as the level of organic pollution rises.

When a huge amount of sewage is dumped into a river,the $BOD$ will

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