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
Correct Answer: D
Solution :
Biochemical Oxygen Demand (BOD) is the amount of oxygen used for biochemical oxidation by micro-organisms in a unit volume of water. Polluted water has high BOD. Thus, when sewage gets mixed with river water, BOD will increase.
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