First slide

Water Pollution and its Control

Question

In clean water, the concentration of

Easy

A

BOD is low but DO is high
B

both BOD and DO are high
C

BOD is high but DO is low
D

both BOD and DO are low

Solution

In clean water, the concentration of BOD (biochemical oxygen demand) is low but the DO (dissolved oxygen) is high. BOD may be defined as the amount of oxygen required by aerobic microorganisms to decompose the organic matter in a sample of water, such as that polluted by sewage. It is used as a measure of the degree of water pollution.

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