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Question : Assertion : As the amount of dissolved oxygen in water decreases, BOD increases. Reason: Microorganisms involved in biodegradation of organic matter requires a lot of dissolved O_(2).

Answer»

both .A. and .R. are TRUE and .R. is the CORRECT EXPLANATION of .A..
both .A. and .R. are true and .R. is not the correct explanation of .A.. 
.A. is true but .R. is false.
Both .A. and .R. are false.

Answer :A


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