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.
Correct Answer: C
Solution :
[c] Biochemical Oxygen Demand (BOD) in river water increases when sewage gets mixed with river water. Biochemical oxygen demand or biological oxygen demand (BOD) is a chemical procedure for determining how fast biological organisms use up oxygen in a body of water. It is used in water quality management and assessment, ecology and environmental science. BOD considered as an indication of the quality of a water source.
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