A higher biochemical oxygen demad in a particular segment of a river indicates that

Options

A. the segment is free from pollution
B. the segment is highly polluted
C. aquatic life has started flourishing
D. the river has high number of aquatic animals

Answer

B

Explanation

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.