[Solved] What happens to the O2 level and BOD of river water at sewage discharge point?

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Q.	What happens to the O2 level and BOD of river water at sewage discharge point?
A.	Sharp decline in O2 level and rise in BOD
B.	O2 level and BOD both increases
C.	No change in BOD but O2 level increases
D.	No change in O2 level but BOD increases
Answer» A. Sharp decline in O2 level and rise in BOD

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