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Biology · 2025 · 3 marks
CBSE 2025 · Region 5 · Set 1 · Q24
(a) Write the full form of BOD. (b) Define BOD. Explain how it is a measure of the organic matter present in the water body.
(a)
Write the full form of BOD.
(b)
Define BOD. Explain how it is a measure of the organic matter present in the water body.
Marking-scheme solution
(a)
BOD – Biochemical Oxygen Demand
(b)
•
The amount of the oxygen that would be consumed if all the organic matter in $\displaystyle 1$ litre of water were oxidised by bacteria.
•
The greater the BOD of waste water more is its polluting potential
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