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Biology · 2025 · 2 marks
CBSE 2025 · Region 1 · Set 1 · Q17
Student to attempt either option-(A) or (B): (A) How are morphine and heroin related? Mention their effect on the human body.
Student to attempt either option-(A) or (B) :
(A)
How are morphine and heroin related ? Mention their effect on the human body.
OR
(B)(i)
Name an alcoholic drink which is produced by the help of microbes :
(1)
With distillation
(2)
Without distillation
(ii)
Explain how cyanobacteria can be used as bio-fertilizer.
Marking-scheme solution
(A)
Heroin is obtained by acetylation of morphine / Both are opioids.
Effects – Morphine is a very effective sedative/painkiller
Heroin is a depressant/slows down body functions.
OR
(B)(i)
(1)
Whisky/ Brandy/ Rum
(2)
Wine/Beer
(ii)
Cyanobacteria fix atmospheric nitrogen, add organic matter to soil ,and increase soil fertility.
All Microbes in Human Welfare questions2025 question paperNCERT solutions: Microbes in Human WelfarePractice Microbes in Human Welfare →
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.