Q. Biochemical Oxygen Demand (BOD) in a river water
A) Remains unchanged when algal bloom occurs
B) Has no relationship with concentration of oxygen in the water
C) Gives a measure of Salmonella in the water
D) Increase when sewage gets mixed with river water
Explanation
Biochemical Oxygen Demand (BOD) is the amount of oxygen used for biochemical oxidation by microorganisms in a unit volume of water. Polluted water has high BOD. Thus when sewage gets mixed with river water, BOD will increase.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.