1.

A higher biochemical oxygen demad in a particular segment of a river indicates thatA. the segment is free from pollutionB. the segment is highly pollutedC. aquatic life has started flourishingD. the river has high number of aquatic animals

Answer» Correct Answer - B
Biochemical oxygen demand or BOD is the oxygen required for microbial decomposition of a unit mass of organic remains. The degree of impurity of water due to organic matter is measured in terms of BOD. A higher BOD of a river indicates that water is highly polluted.


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