Q. 17

Study the graph g

Answer :

When sewage is discharged into the river then various bacteria, biological waste and other components and waste material is increased thereby increasing the B.O.D. (i.e. Biological Oxygen Demand ) of the water increases. This increase in B.O.D. is due to the action of bacteria on various components of sewage in the river water. This increase in B.O.D. causes the decrease in the concentration of dissolved oxygen in the river thus representing the fall in the graph but as the bacterial action decreases the oxygen concentration increases thus a rise in the graph showing increase in oxygen concentration in river water back to normal.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses

(a) What wBiology - Exemplar

Why is aerobic deBiology - Exemplar

(a) DiscusBiology - Exemplar

Why are flocs impBiology - Exemplar