Biochemical oxygen demand (BOD) in a river water:
Correct answer: C. Increases when sewage gets mixed with 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.
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. Biochemical Oxygen Demand (BOD) typically increases when sewage gets mixed with river water. BOD is a measure of the amount of dissolved oxygen that microorganisms need to decompose organic matter in water. When sewage, which contains organic materials, is discharged into a river, it introduces a significant amount of organic matter into the water.
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