Question

Assertion (A): The primary treatment of sewage is called the physical treatment while the secondary treatment is called the biological treatment.

Reason (R): Primary sewage treatment depends only upon sedimentation properties of materials present in sewage and filtration.

Options

• Both assertion (A) and reason (R) are true, and reason is the correct explanation of assertion.

• Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.

• Assertion (A) is true but reason (R) is false.

• Both assertion (A) and reason (R) are false.

Answer 1

Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.

Explanation:

Both statements are true. Filtration and sedimentation explain why primary treatment is physical, but the reason does not explain why secondary treatment is biological; that stage uses microbes to decompose organic matter.