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Which of the following is correct for th...

Which of the following is correct for the diagram given below?

A

(A) BOD, (B) Point of sewage discharge, (C) Dissolved oxygen

B

(A) Dissolved oxygen, (B) Point of treated water discharge, (C) BOD

C

(A) BOD, (B) Point of treated water discharge, (C) Dissolved oxygen

D

(A) Dissolved oxygen (B), Point of sewage discharge, (C) BOD

Text Solution

Verified by Experts

The correct Answer is:
D
The above figure shows some of the changes that one may notice following discharge of sewage into a river. Micro organisms involved in biodegradation of organic matter in the racially water body consume a lot of oxygen and as a result there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge.
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