BOD is the amount of

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oxygen present in waterbody

oxygen required by the aquatic organisms

oxygen required by the microbes for degradation of organic matter

agrochemicals like nitrates and phosphates present in the water

answer is C.

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Detailed Solution

BOD is a measure of the amount of oxygen required to remove waste organic matter from water in the process of decomposition by aerobic bacteria (those bacteria that live only in an environment containing oxygen). Domestic sewage primarily contains biodegradable organic matter, which readily decomposes –due to bacteria and other micro-organisms, which can multiply using these organic substances as substrates and hence utilise some of the components of sewage. It is possible to estimate the amount of biodegradable organic matter in sewage water by measuring Biochemical Oxygen Demand (BOD).

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