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Biology · 2023 · 2 marks
CBSE 2023 · Region 3 · Set 2 · Q21
Explain the role of microorganisms in the following: (a) Reducing the sugar content in grape juice (b) Production of a fuel
Explain the role of microorganisms in the following :
(a)
Reducing the sugar content in grape juice
(b)
Production of a fuel
Marking-scheme solution
(a) Saccharomyces cerevisiae/ Yeast, is used to ferment grape juice/fermentation to convert sugar into ethanol/ alcohol
(b) Methanogens, anaerobically act on cellulosic material in excreta (dung) of cattle to produce biogas which is used as a fuel.
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CBSE Class 12 Biology past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.