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.
Biochemical Oxygen Demand (BOD) in a river water
NEET UG 2009 — Zoology Microbes in Human Welfare
2009mcqmedium
Biochemical Oxygen Demand (BOD) in a river water
Official previous-year question
Held on 30 Apr 2009 · Verified 9 Jul 2026.
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
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