A) \[D.O\,\,\downarrow ,\,\,BOD\downarrow \]
B) \[D.O\uparrow ,\,\,B.OD\uparrow \]
C) \[D.O\downarrow \,,\,\,BOD\uparrow \]
D) \[D.O\downarrow \,,\,\,BOD\,\,not\,\,affected\]
Correct Answer: C
Solution :
In a polluted water body dissolved oxygen decreases while biochemical oxygen demand increases.
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