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Assertion: Ribosomal… (Class 12 Biology SQP 2023-24, Q14)

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BiologyCBSE Class 12 · Sample paper, session 2023-24 · 1 mark · Assertion-reason

CBSE Class 12 Biology sample paper 2023-24: question 14

From the official CBSE sample question paper for 2023-24, section A, question 14, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q14 · 1 mark · Assertion-reasonCompetency-basedMolecular Basis of Inheritance

Assertion: Ribosomal RNA is synthesized in the nucleus of the cell.
Reason: It is translated with the enzyme RNA polymerase III.

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

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2023-24.

Hints

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

Hint 1

Is rRNA translated, or is it transcribed?

Hint 2

Recall which RNA polymerase makes which type of RNA.

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. rRNA is synthesised in the nucleus, within the nucleolus, so the assertion is true.

    ½ mark

  2. rRNA is transcribed by RNA polymerase I and is never translated. RNA polymerase III transcribes tRNA and 5S rRNA. The reason is therefore false.

    ½ mark

Answer: (C) A is true but R is false

Where the marks are

  • Confirms that rRNA is made in the nucleus (0.5 mark)
  • Identifies the error in R: rRNA is transcribed by RNA polymerase I, not translated (0.5 mark)

Revise the chapter

Practise this chapterBoard-style questions from Molecular Basis of Inheritance, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2023-24: 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.