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The amount of oxygen required by the mic...

The amount of oxygen required by the microbes in the decomposition of organic matter is called :

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biological oxygen demand (BOD)
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Assertion (A) : The lower the concentration of DO , the the more polluted is the water sample. Reason (R) : Oxygen is consumed by microbes for the decomposition of organic matter present in water.

A : The lower the concentration of DO the more plluted is the water sample. R : Oxygen is consumed by micobes for the decomposition of organic matter present in water.

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). Which of the following statements are correct ?

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