Home Biology Microbes in Human Welfare Skill Builder Choose the correct pair of statements.
Biology Microbes in Human Welfare Skill Builder Single Correct MCQ
Published on: August 13, 2026

Choose the correct pair of statements.

A
The effluent from the primary treatment plant is generally released into natural water bodies.
& ,
B
In primary treatment, floating debris is removed by sequential filtration and the grit is removed by sedimentation.
& (E) ,
C
The greater the BOD of waste water, more is its polluting potential.
& &
D
Biogas is a mixture of gases such as methane, hydrogen sulphide and carbon dioxide.
(E) BOD is a measure of the inorganic matter present in the water.

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After primary treatment of sewage, the effluent from the primary settling tank is taken for secondary treatment. The effluent from the secondary treatment plant is generally released into natural water bodies like rivers and streams. BOD is the measure of organic matter present in sewage.

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