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Sharp decline in DO (dissolve oxygen) and increase in BOD of water indicate the

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Presence of large amounts of dissolved organic matter.

Presence of low amounts of organic matter.

Absence of aerobic microorganisms.

Presence of heavy metals in water body.

answer is A.

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Biochemical Oxygen Demand (BOD) gives an estimate of the amount of biodegradable organic matter in sewage water.

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