Assertion (A) :If BOD level of water in a reservoir is less than 5 ppm it is highly polluted.Reason (R) :High biological oxygen demand means low activity of bacteria in water.
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a
Both A and R are correct and R is the correct explanation of A.
b
Both A and R are correct but R is not the correct explanation of A
c
Both A and R are not correct
d
A is not correct but R is correct
answer is C.
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Detailed Solution
Extent of pollution BOD.Higher BOD indicates greater pollution.