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(A) $BOD$ stands for Biochemical Oxygen Demand.It is the amount of oxygen required by aerobic microorganisms to decompose the organic matter present i

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increases

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(A) $BOD$ stands for Biochemical Oxygen Demand.It is the amount of oxygen required by aerobic microorganisms to decompose the organic matter present in $1 	ext{ litre}$ of water.As the amount of organic matter in a water body increases,the microorganisms require more oxygen to decompose it.Therefore,the $BOD$ increases,which serves as an indicator of water pollution.

As the organic matter increases in a water body,the $BOD$

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