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What does the high Biological Oxygen Demand (BOD) indicates? 

(a) High level of Microbial Pollution 

(b) Low level of Microbial Pollution 

(c) Absence of Microbial Pollution 

(d) Water is fully pure

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Correct option: (a) High level of Microbial Pollution

Explanation:

Oxygen is required for decomposition of microorganism under the water. Increase in waste and pollution enhances the decomposition activities and thereby reduces the availability of oxygen for other organic activities under the water body. Hence a higher demand of oxygen (BOD) indicates higher level of microbial pollution.

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