Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm):
- (A)for the photochemical breakdown of waste present in volume of a water body.
- (B)for sustaining life in a water body.
- (C)by bacteria to break-down organic waste in a certain volume of a water sample.✓ Correct
- (D)by anaerobic bacteria to breakdown inorganic waste present in a water body.
Answer: (C)
Solution
Biochemical Oxygen Demand measures how much dissolved oxygen aerobic bacteria consume as they break down the organic matter in a given volume of a water sample over a set period. It is an index of organic pollution, since the more biodegradable waste the water carries, the more oxygen the microbes draw and the higher the BOD. So BOD is the oxygen, in ppm, used by bacteria to decompose organic waste in a certain volume of water.
JEE Main · 2020 · 09 Jan 2020 · Shift 2 · Single correct option