has no relationship with concentration of oxygen in the water
gives a measure of Salmonella in the water
increases when sewage gets mixed with river water
remains unchanged when algal bloom occurs
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The Correct Option isC
Solution and Explanation
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.