plz explain the diag. of effect of sewage discharge on sm imp. characteristic of a river given in bio ncert book pg.16.3

Dear Student
solution to your asked query is provided below:

According to this diagram when the concentration of sewage discharge (waste material that may create conditions for the growth of micro-organisms that carry out the degradation of organic matter by using oxygen dissolved in the water) increases, dissolved oxygen in the river water decreases due to excessive use of it by micro-organism that carries out biodegradation of organic matter, which result in the death of many clean water organism (aquatic organisms). But as the sewage discharge in rivers decreases, dissolved oxygen in the river increases that result in the reappearance of the aquatic organisms.

Hope this information clears your doubt about the topic.

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