What do 'X','Y',and 'Z' represent in the give | vedclass

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(C) The figure represents the effect of sewage discharge into a river. $Y$-axis represents the concentration of dissolved oxygen $(DO)$ and biological

Vedclass · Accepted Answer

$DO$,concentration,and direction of flow

Vedclass · Answer

(C) The figure represents the effect of sewage discharge into a river. $Y$-axis represents the concentration of dissolved oxygen $(DO)$ and biological oxygen demand $(BOD)$. As sewage enters the river,the $BOD$ increases sharply and $DO$ decreases. '$X$' represents the dissolved oxygen $(DO)$ curve,which decreases near the point of sewage discharge and recovers downstream. '$Y$' represents the concentration of $DO$ and $BOD$. '$Z$' represents the direction of water flow downstream from the point of sewage discharge. Therefore,'$X$' is $DO$,'$Y$' is concentration,and '$Z$' is the direction of flow.

What do '$X$','$Y$',and '$Z$' represent in the given figure respectively?

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