allerySewage is treated until its BOD is:
AReduced
BDoubled
CTrebled
DIgnored
Answer & Solution
Correct answer: A. Reduced
1. A high BOD marks water heavy with organic matter.
2. Treatment removes that matter.
3. So sewage is treated till the BOD is reduced.
4. The answer is reduced.
_Source: syllabus Biology, Ch 8 'Microbes in Human Welfare'_
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