NEET UG BIOLOGY MCQ: ENVIRONMENTAL ISSUES

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In which one of the following, the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

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Correct option: B

SE < PE < S < DE

Option A (SE < S < PE < DE) is correct because sugar mill effluent (SE) generally has the lowest BOD, followed by sewage (S), paper mill effluent (PE), and distillery effluent (DE) which has the highest BOD.

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