Question
Biology Question on Environmental Issues
Biochemical oxygen demand (BOD) in a river water
A
has no relationship with concentration of oxygen in the water
B
gives a measure of Salmonella in the water
C
increases when sewage gets mixed with river water
D
remains unchanged when algal bloom occurs
Answer
increases when sewage gets mixed with river water
Explanation
Solution
Biochemical oxygen demand (BOD) is the amount of oxygen taken up by microorganisms that decompose organic waste matter in water. It is therefore used as a measure of the amount of certain types of organic pollutant in water.