CBSE 2024 · Region 4 · Set 3 · Q24 · 3 marks
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.
Microbes in Human WelfareMicrobes in Sewage TreatmentUnderstandshort_answermedium
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CBSE Class 12 Biology past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.