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a
estimating the amount of non-biodegradable organic matter in water.
b
estimating the amount of biodegradable organic matter in water.
c
counting the microbial species richness in the water body.
d
estimating the population size of aquatic flora and fauna.
answer is B.
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Detailed Solution
BOD is the amount of oxygen required by microorganisms for the decomposition of organic wastes present in water. It is possible to estimate the amount of biodegradable organic matter in sewage water by measuring Biochemical Oxygen Demand (BOD).