1.

Assertion( A ) : If BOD level of water in a reservoir is more than 5 ppm it is highly polluted Reason ( R ) : High biological oxygen demand means high activity of bacteria in water

Answer»

Both ( A) and R are CORRECT and ( R ) is the correct EXPLANATION of ( A )
Both ( A ) and R are correct and (R ) is not the correct explanation of ( A)
Both ( A ) and R are not correct
(A) is correct but ( R ) is not correct

ANSWER :d


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