Assertion (A): Floc formation significantly reduces the BOD of primary effluent.
Reason (R): While growing flocs consume major part of organic matter present in primary effluent.

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Both A and R are true and R is the correct explanation of A

A is true but R is false

Both A and R are true but R is not the correct explanation of A

Both A and R is false

answer is A.

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Detailed Solution

Flocs are masses of bacteria associated with fungal filaments to form mesh like structures. While growing, these microbes consume the major part of the organic matter in the effluent. This significantly reduces the BOD (biochemical oxygen demand) of the effluent.

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