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In a particular river, BOD

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remains unchanged with algal bloom

slightly decreases with eutrophication

increases when domestic sewage mixes with water

is unaffected by the levels of oxygen in the water

answer is C.

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Detailed Solution

BOD increases when water is mixed with domestic sewage.

Algal bloom deprives water body of oxygen, so BOD increases.

Eutrophied waters are rich in organic matter and hence BOD is high.

When dissolved oxygen(DO) is high, BOD is low.

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