NEET 2007 Biology question

Not in NEET syllabus

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?

(1)S < DE < PE < SE
(2)SE < S < PE < DECorrect
(3)SE < PE < S < DE
(4)PE < S < SE < DE

Answer: (2)

Solution

BOD is the amount of oxygen required by microbes to oxidise the organic matter present in a water sample; the higher the BOD, the more polluted the water. According to the values quoted in the reference solution, the BOD of distillery effluent is about 40,000 mg/L (by far the highest, being rich in sugars and organic

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Question ID VK-089798