BOD is measure of.

Industrial waste being poured in water body

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Extent of pollution with organic compounds

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CO combined with haemoglobin

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O_{2}

required by green plants during night

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Solution

The correct option is C Extent of pollution with organic compounds
The microorganisms in polluted bodies use dissolved oxygen to metabolise organic matter in polluted waters. This is called biochemicalical oxygen demand. The more organic matter in sewage and polluted bodies, greater the BOD and hence less oxygen is left availble tor higher animals like fishes.

Suggest Corrections

	List - I		List - II
A.	TLV	1.	Oxygen required to oxidise organic substance present in polluted water.
B.	COD	2.	Oxygen used by microorganisms present in water for 5 days
C.	DO	3.	$O_{2}$ present in water is in dissolved state.
D.	BOD	4.	Permissible level of pollutant that can be present in a mine.
		5.	$O_{2}$ that is present in atmosphere.