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What is B.O.D. : -
A
The amount of $O_2$ utilised by organisms in water
B
The amount of $O_2$ utilised by micro-organisms for decomposition
C
The total amount of $O_2$ present in water
D
All of the above
Detailed Solution
BOD (biochemical oxygen demand) is the amount of oxygen consumed by microorganisms (bacteria) in decomposing (oxidising) the organic matter present in a litre of water, usually measured over 5 days at 20 °C.
It is a measure of the amount of biodegradable organic pollution: the more organic waste (e.g. sewage), the higher the BOD.
So BOD is the amount of $O_2$ utilised by micro-organisms for decomposition.
It is a measure of the amount of biodegradable organic pollution: the more organic waste (e.g. sewage), the higher the BOD.
So BOD is the amount of $O_2$ utilised by micro-organisms for decomposition.