Biochemical Oxygen Demand (BOD) in a river water

Options

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. Increases when sewage gets mixed with river water

Answer

B

Explanation

The demand of `O_2` is directly related to increasing input of organic waste and is expressed as biochemical oxygen demand (BOD) of water. BOD is a measure of oxygen required by aerobic decomposers for the biochemical degradation of organic materials.