CBSE 2026 · Region 3 · Set 1 · Q29 · 4 marks
Read the following passage and answer the question that follow : The data below shows the concentration of nicotine smoked by a smoker taking $\displaystyle 10$ puffs/minute.
Smoking Cigarette(a)With reference to the above graph, explain the concentration of nicotine in the blood at $\displaystyle 10$ minutes.(ii)How will this affect the concentration of carbon monoxide and haem-bound oxygen at $\displaystyle 10$ minutes?(b)How does cigarette smoking result in high blood pressure and increase in heart rate ?(c)To which class of compounds does nicotine belong ? Name one other drug from the same class.
Read the following passage and answer the question that follow : The data below shows the concentration of nicotine smoked by a smoker taking $\displaystyle 10$ puffs/minute.
Smoking Cigarette
(a)
With reference to the above graph, explain the concentration of nicotine in the blood at $\displaystyle 10$ minutes.
(ii)
How will this affect the concentration of carbon monoxide and haem-bound oxygen at $\displaystyle 10$ minutes?
(b)
How does cigarette smoking result in high blood pressure and increase in heart rate ?
(c)
To which class of compounds does nicotine belong ? Name one other drug from the same class.
Marking-scheme solution
(i)
Maximum / 45mg per cm3 at $\displaystyle 10$ minutes.
Or
(ii) Concentration of Carbon monoxide increases and concentration of
haem- bound oxygen decreases
(b)
Nicotine stimulates adrenal gland which releases adrenaline / nor adrenaline in blood resulting in increase of blood pressure and heart beat.
(c)
Nicotine is an Alkaloid
Coccaine / coke /crack / morphine / cannabinoids.
Human Health and DiseaseDrugs and Alcohol AbuseAnalysecase_studymedium
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CBSE Class 12 Biology past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.