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A : The lower the concentration of DO th...

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.

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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.

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

BOD is a measure of polluting organic matter present in a sample of:

The percentage of oxygen present in water is

Excessive accumulation of organic matter in water bodies leads of :

The number of moles of oxygen obtained by the electrolytic decomposition of 90g water is :

The concentration of dissolved oxygen (DO) in cold water can go upto:

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