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Assertion (A) : The use of… (Class 12 Biology 2026, Q16)

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BiologyCBSE Class 12 · Board exam 2026, set 57/5/1 · 1 mark · Assertion-reason

CBSE Class 12 Biology 2026: question 16

Set in the CBSE Class 12 board exam of 2026, paper 57/5/1, section A, question 16, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q16 · 1 mark · Assertion-reasonCompetency-basedBiotechnology: Principles and Processes

Assertion (A) : The use of chitinase enzyme is necessary for the separation of DNA from yeast cells but not in the case of Spirogyra.
Reason (R) : Fungal cell wall is made up of fungal chitin.

  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 2026 board paper, set 57/5/1.

Hints

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

Hint 1

What is the cell wall of a fungus made of?

Hint 2

What is the wall of an alga such as Spirogyra made of?

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. Yeast is a fungus, and its cell wall is made of chitin, so chitinase is needed to break it. Spirogyra is an alga with a cellulose wall, which needs cellulase instead.

    ½ mark

  2. Both statements are true and R explains A. The answer is (A).

    ½ mark

Answer: (A)

Where the marks are

  • Judges both statements true and R the correct explanation (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Biotechnology: Principles and Processes, one at a time, marked against the answer key and marking points.Back to the full paper2026 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.