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The graph given below represents the eff...

The graph given below represents the effect of sewage discharge on some important characteristics of river.
Select the correct option with respect to the peaks A and B.

A

Peak A - Sharp increase in BOD, disappearance of clean water organisms.
Peak B - Increase in dissolved oxygen, reappearance of clean water organisms.

B

Peak A - Increase in dissolved oxygen, reappearance of clean water organisms.
Peak B - Sharp decline in dissolved oxygen, disappearance of clean water organisms.

C

Peak A - Sharp increases in BOD, appearance of clean water organisms
Peak B - Increase in dissolved oxygen, disappearance of clean water organisms

D

Peak A - Increased number of anaerobic bacteria, disappearance of clean water organisms.
Peak B - Sharp decline in dissolved `O_(2)`, reappearance of clean water organisms.

Text Solution

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The correct Answer is:
B
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