Assertion : Primary treatment of sewage is also called biological treatment.
Reason : Primary sewage treatment depends only on density of materials in sewage

Dear Student,

Assertion and reaason both are wrong.
Explaination:-
A: secondary treatment of sewage is also called biological treatment because in secondary treatment biological factors/organisms play a major role in the treatment.
R: It does not only depends on density of materials present.

Regards.

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