CBSE 2025 · Region 1 · Set 1 · Q17 · 2 marks
Student to attempt either option-(A) or (B) :How are morphine and heroin related ? Mention their effect on the human body.(B)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.
Student to attempt either option-(A) or (B) :
How are morphine and heroin related ? Mention their effect on the human body.
(B)
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
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.
(B)
(1)
Whisky/ Brandy/ Rum
(2)
Wine/Beer
(ii)
Cyanobacteria fix atmospheric nitrogen, add organic matter to soil ,and increase soil fertility.
Microbes in Human WelfareMicrobes in Household ProductsUnderstandvery_short_answermedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.