The figure below shows the effect of sewage d | vedclass

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(B) When sewage is discharged into a river,the organic matter content increases,which leads to an increase in the Biological Oxygen Demand $(BOD)$ as

Vedclass · Accepted Answer

$BOD$,Dissolved Oxygen

Vedclass · Answer

(B) When sewage is discharged into a river,the organic matter content increases,which leads to an increase in the Biological Oxygen Demand $(BOD)$ as microorganisms consume oxygen to decompose the organic matter.As $BOD$ increases,the Dissolved Oxygen $(DO)$ levels in the water decrease significantly,causing the death of fish and other aquatic organisms.In the provided graph,the curve that starts high and drops sharply at the point of sewage discharge represents Dissolved Oxygen $(DO)$,while the curve that starts low and rises sharply represents $BOD$.Therefore,$P$ corresponds to $BOD$ and $Q$ corresponds to Dissolved Oxygen.

The figure below shows the effect of sewage discharge on some important characteristics of a river. What are $P$ and $Q$?

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