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Biology · 2024 · 3 marks
CBSE 2024 · Region 4 · Set 3 · Q24
Explain the role of the following during the sewage treatment: (a) flocs (b) anaerobic sludge digester
Explain the role of the following during the sewage treatment :
(a)
flocs
(b)
anaerobic sludge digester
Marking-scheme solution
(a)
These consume the major part of organic matter in the effluent, and significantly reduce the BOD.
(b)
Anaerobic sludge digestors where anaerobic digestion of sludge takes place, producing ‘Biogas’ in the process.
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CBSE Class 12 Biology past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.