Assertion :Protozoa is useful in sewage treatment. Reason: They decompose organic matter.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Sewage treatment is the process of removing contamination from the wastewater and household sewage water.
The protozoan is helpful for this process, they form a flock and help in the decomposing matter by increasing BOD.
It helps in improving the quality of the effluent by maintaining the density of dispersed bacterial populations.
So, the correct option is 'Both Assertion and reason are correct Reason is the correct explanation of Assertion.'

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