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Definition of BOD

As the organi...

Question

As the organic matter increases in a water body, the BOD

A

Increases

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B

Decreases

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C

Remains unchanged

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D

Not a parameter

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Solution

The correct option is D Increases
BOD is Biological Oxygen Demand. It is the amount of oxygen required by microbes to break down the organic matter present in a certain volume of a sample of water.
In polluted water, BOD is high as it contains a large number of organisms.
High BOD values in the water of a river mean that the water is highly polluted.
Thus, the correct answer is option A.

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Q. Read the following statements (A-D) related to Biochemical Oxygen Demand (BOD) and identify the correct option stating true (T) and false (F).

A. Biochemical oxygen demand is defined as the amount of dissolved oxygen needed by microorganisms in decomposing the inorganic wastes.
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C. The BOD increases with time as organic matter gets decomposed.
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Definition of BOD

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