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Identify a, b, c, d, e and f… (Class 12 Biology 2024, Q22)

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BiologyCBSE Class 12 · Board exam 2024, set 57/5/1 · 3 marks · Short answer

CBSE Class 12 Biology 2024: question 22

Set in the CBSE Class 12 board exam of 2024, paper 57/5/1, section C, question 22, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q22 · 3 marks · Short answerBiotechnology and its Applications

Identify a, b, c, d, e and f in the table given below :

Sl. No.OrganismBioactive MoleculeUse
1.Monascus purpureusab
2.cdAntibiotic
3.eCyclosporin Af

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 57/5/1.

Hints

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

Hint 1

Recall the NCERT list of bioactive molecules made by microbes.

Hint 2

One molecule from a yeast lowers cholesterol; Cyclosporin A comes from a fungus and suppresses immunity.

Hint 3

The first antibiotic discovered came from a mould studied by Fleming.

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 – Statins (produced by the yeast Monascus purpureus).

    ½ mark

  2. b – Blood-cholesterol lowering agent. Statins competitively inhibit the enzyme of cholesterol synthesis.

    ½ mark

  3. c – Penicillium notatum (any other correct antibiotic-producing organism is acceptable).

    ½ mark

  4. d – Penicillin (the antibiotic matching the organism named in c).

    ½ mark

  5. e – Trichoderma polysporum (a fungus).

    ½ mark

  6. f – Immunosuppressive agent, used in organ-transplant patients.

    ½ mark

Answer: a – Statin; b – blood-cholesterol lowering agent; c – Penicillium notatum; d – Penicillin; e – Trichoderma polysporum; f – immunosuppressant (organ transplants).

Where the marks are

  • Each of a, b, c, d, e and f correctly identified (½ mark each, ½ × 6)

Revise the chapter

Practise this chapterBoard-style questions from Biotechnology and its Applications, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 57/5/1: 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.