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(C) Biochemical Oxygen Demand $(BOD)$ is a measure of the amount of dissolved oxygen required by aerobic microorganisms to break down the organic matt

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Microbes and organic matter

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(C) Biochemical Oxygen Demand $(BOD)$ is a measure of the amount of dissolved oxygen required by aerobic microorganisms to break down the organic matter present in a given volume of water.$BOD$ is directly related to the amount of organic matter in the water sample.Microbes (aerobic bacteria) consume oxygen to decompose this organic matter.Therefore,$BOD$ is concerned with both microbes and organic matter,as the demand for oxygen is created by the microbial decomposition of organic pollutants.

$BOD$ is concerned with

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