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Biology · 2026 · 3 marks
CBSE 2026 · Region 3 · Set 1 · Q27
Cow dung and water are mixed and fed into a biogas plant to allow digestion of biowastes. The person performing this process says that there is no…
Cow dung and water are mixed and fed into a biogas plant to allow digestion of biowastes. The person performing this process says that there is no need to provide an inoculum.
(a)
Do you agree with him ? Justify your answer.
(b)
What happens to the biowaste inside the digester ?
(c)
Name the useful by-products obtained from this process and mention how they are used.
Marking-scheme solution
(a)
Yes, there is no need of inoculum as the cow dung contains a lot of methanogens.
(b)
Inside the digester the biowaste is digested by anaerobic bacteria
(methanogens) present in the cow dung.
(c)
Useful By-products
• Biogas, used for cooking and lighting/
• Slurry, used as fertiliser / manure
(Anyone with correct corelation-mark for its use)
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.