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Question: Answered & Verified by Expert
Biochemical Oxygen Demand (BOD) in a river water
BiologyMicrobes in Human WelfareNEETNEET 2009 (Screening)
Options:
  • A remains unchanged when algal bloom occurs
  • B has no relationship with concentration of oxygen in the water
  • C gives a measure of Salmonetla in the water
  • D increases when sewage gets mixed with river water
Solution:
2604 Upvotes Verified Answer
The correct answer is: increases when sewage gets mixed with river water
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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