A) Increases
B) decreases
C) Sharply decrease
D) remains unchanged
Correct Answer: A
Solution :
[a] By dumping of a huge amount of sewage, the oxygen levels are depleted, which are reflected in terms of BOD values of water. The number of microbes also increases tremendously and these also consume most of the oxygen. As a result of this, the BOD of the river water increases.You need to login to perform this action.
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