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Biology · 2022 · 2 marks
CBSE 2022 · Region 3 · Set 2 · Q4
What are flocs? State their role in biological treatment of sewage.
What are flocs ? State their role in biological treatment of sewage.
Marking-scheme solution
Masses of bacteria associated with fungal filaments to form mesh like structures.
Consume major part of organic matter in the effluent / lower BOD significantly/reduces polluting potential .
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CBSE Class 12 Biology past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.