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Answer the following. (Class 12 Biology 2026, Q26)

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BiologyCBSE Class 12 · Board exam 2026, set 57/1/1 · 3 marks · Short answer

CBSE Class 12 Biology 2026: question 26

Set in the CBSE Class 12 board exam of 2026, paper 57/1/1, section C, question 26, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q26 · 3 marks · Short answerHuman Health and Disease

Answer the following.

  1. (a)

    Mention the scientific name of the source plant and the part from which opioids are extracted.

    1 mark
  2. (b)

    How are morphine and heroin related ? Mention the effect each one of them has on human body.

    2 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 57/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Opioids come from the poppy plant. Give its full scientific name.

Hint 2

Heroin is a chemically modified form of morphine. Which chemical group is added?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. (a) Source plant: poppy, Papaver somniferum.

    ½ mark

  2. Part used: the latex obtained from the plant (its unripe capsules).

    ½ mark

  3. (b) Heroin (smack) is chemically diacetylmorphine. It is obtained by acetylation of morphine.

    1 mark

  4. Effect of morphine: it is a very effective sedative and painkiller, useful for patients who have undergone surgery.

    ½ mark

  5. Effect of heroin: it is a depressant and slows down body functions.

    ½ mark

Answer: (a) Papaver somniferum, latex; (b) heroin is acetylated morphine (diacetylmorphine); morphine is a sedative and painkiller, heroin a depressant that slows body functions

Where the marks are

  • Papaver somniferum (½ mark)
  • Latex (½ mark)
  • Heroin formed by acetylation of morphine (1 mark)
  • Morphine is a sedative/painkiller (½ mark)
  • Heroin is a depressant that slows body functions (½ mark)

Revise the chapter

Practise this chapterBoard-style questions from Human Health and Disease, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 57/1/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.