A) By bacteria to break-down organic waste in a certain volume of a water sample
B) For sustaining life in a water body
C) By anaerobic bacteria to break down inorganic waste present in a water body
D) For the photochemical break down of waste present in \[1\text{ }{{m}^{3}}\]volume of a water body
Correct Answer: A
Solution :
BOD is the amount of oxygen required by bacteria to break down the organic matter present in a certain volume of sample of water.
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