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Assertion (A) : Swiss cheese… (Class 12 Biology 2025, Q13)

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BiologyCBSE Class 12 · Board exam 2025, set 57/7/1 · 1 mark · Assertion-reason

CBSE Class 12 Biology 2025: question 13

Set in the CBSE Class 12 board exam of 2025, paper 57/7/1, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · Assertion-reasonCompetency-basedMicrobes in Human Welfare

Assertion (A) : Swiss cheese is characterized by large holes due to production.
Reason (R) : It is ripened by growing a specific fungi.

  1. (A)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  2. (B)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  3. (C)Assertion (A) is true, but Reason (R) is false.
  4. (D)Assertion (A) is false, but Reason (R) is true.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 57/7/1.

Hints

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

Hint 1

Which microbe produces the holes in Swiss cheese?

Hint 2

Is that microbe a fungus or a bacterium?

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. The large holes in Swiss cheese come from CO₂ produced by the bacterium Propionibacterium sharmanii, so the Assertion is true.

  2. Ripening by specific fungi is true of Roquefort cheese, not Swiss cheese, so the Reason is false. Hence (C).

    1 mark

Answer: (C)

Where the marks are

  • A true, R false (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Microbes in Human Welfare, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 57/7/1: 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.