Biochemical oxygen demand (BOD) is __________.

The amount of oxygen required to oxidize organic substances in polluted water

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The amount of oxygen used by organism present in polluted water during five days at 20 degree centigrade

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The amount of oxygen present biological organisms

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Both A and B

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Solution

The correct option is B The amount of oxygen used by organism present in polluted water during five days at 20 degree centigrade
Biochemical oxygen demand (BOD, also called biological oxygen demand) is the amount of dissolved oxygen needed (i.e., demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.

The BOD value is most commonly expressed in milligrams of oxygen consumed per litre of the sample during 5 days of incubation at 20°C and is often used as a surrogate for the degree of organic pollution of water.

Hence, the correct option is $B$

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Similar questions

Q32 Consider the following statements,

i) The chemical oxygen demand (COD) test is commonly used to indirectly measure the amount of organic compounds in water.

ii) Biochemical oxygen demand is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.

Which of the above statements is/are correct?

The amount of O₂ required by bacteria in water to breakdown wastes into simple inorganic substances is called

Q. The correct match is:

	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.

Q. Biochemical Oxygen Demand (BOD) is a measure of organic material present in water. BOD value less than 5 ppm indicates a water to be ________.

Q. Biochemical Oxygen Demand, (BOD) is a measure of organic material present in water. BOD of less than 5 ppm indicates a water sample to be:

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