Skip to content

Assertion (A) : Repetitive… (Class 12 Biology 2026, Q14)

questionbuddy.in/q/cbse-12-biology-2026-57-5-1-q14-repetitive-sequences-make-very-large

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

CBSE Class 12 Biology 2026: question 14

Set in the CBSE Class 12 board exam of 2026, paper 57/5/1, 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 (A) : Repetitive sequences make up a very large portion of human genome.
Reason (R) : Repetitive sequences do not have direct coding functions in the genome.

  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

Check each statement against the HGP salient features.

Hint 2

Ask whether R actually explains why the repeats are so abundant.

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. Both statements are true: repetitive sequences form a very large part of the human genome, and they have no direct coding function.

    ½ mark

  2. Lacking a coding function does not explain why they are so abundant, so R is not the correct explanation of A. The answer is (B).

    ½ mark

Answer: (B)

Where the marks are

  • Judges both statements true but R not the explanation (1 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 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.