Chemistry Enviromental Chemistry ( Not In Syllabus ) Water pollution, Soil Pollution and Waste Management Single Correct MCQ
Published on: August 14, 2026

Measurement of rate of oxygen utilisation by a unit volume of water over a period of time is to measure :

A
fermentation
B
biogas generation
C
biosynthetic pathway
D
biological oxygen demand.

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The correct answer is:
D

The presence of fertilizers and household wastes in water enhances the growth of algae. This algae cover the surface of water and reduces the oxygen concentration in water, thus fishes die in water bodies due to the lack of oxygen gas.

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