Relation between DO and BOD is that they

Are directly proportional

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Are inversely proportional

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Are not related

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Always remain equal to each other

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Solution

The correct option is B Are inversely proportional
Biological Oxygen Demand (BOD) is a measure of the oxygen used by microorganisms to decompose this waste. This results in a high BOD level. When BOD levels are high, dissolved oxygen levels decrease because the oxygen that is available in the water is being consumed by the bacteria.
So the correct answer is 'Are inversely proportional'.

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Assuming land to be uniformly fertile, the area of land and the yield on it vary
(a) directly with each other
(b) inversely with each other
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(d) Sometimes directly and sometimes inversely with each other

Question 4

The number of teeth and the age of a person vary
(a) directly with each other
(b) inversely with each other
(c) neither directly nor inversely with each other
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