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Assertion (A)… (Class 12 Biology SQP 2026-27, Q13)

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BiologyCBSE Class 12 · Sample paper, session 2026-27 · 1 mark · Assertion-reason

CBSE Class 12 Biology sample paper 2026-27: question 13

From the official CBSE sample question paper for 2026-27, 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-basedHuman Reproduction

Assertion (A): Spermatogenesis is an ongoing process throughout the reproductive life of a human male, while oogenesis is a discontinuous process.
Reason (R): Oogenesis begins during the embryonic stage, gets arrested at prophase-I, resumes after puberty, and is arrested again at metaphase-II.

  1. (A)Both A and R are true and R is the correct explanation of A.
  2. (B)Both A and R are true but 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 2026-27.

Hints

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

Hint 1

When do the arrests occur in oogenesis?

Hint 2

Ask whether these arrests are what make oogenesis discontinuous.

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. Spermatogenesis continues from puberty throughout life, so A is true.

  2. Oogenesis starts in the foetus, is arrested at prophase I, resumes at puberty, and is arrested again at metaphase II until fertilisation. R is true and explains why oogenesis is discontinuous. Option (A).

    1 mark

Answer: (A)

Where the marks are

  • Recognises both statements are true and R explains A (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Human Reproduction, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2026-27: 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.