The amount of oxygen used by microorganisms present in water for five days at 20 $^{\circ}$ C is called:

COD

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TLV

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BOD

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Solution

The correct option is D BOD
The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water is called Biochemical Oxygen Demand (BOD). The amount of BOD in the water is a measure of the amount of organic material in the water, in terms of how much oxygen will be required to break it down biologically.

Hence, the correct option is $D.$

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Similar questions

	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.

B O D_{5}

The chemical ___________ present in clove is used for destroying cell walls of microorganisms and fungus.

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