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Identify the stage of… (Class 12 Biology 2026, Q18b)

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BiologyCBSE Class 12 · Board exam 2026, set 57/1/1 · 2 marks · Very short answer

CBSE Class 12 Biology 2026: question 18(b)

Set in the CBSE Class 12 board exam of 2026, paper 57/1/1, section B, question 18(b), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q18(b) · 2 marks · Very short answerHuman Reproduction

Identify the stage of follicle where primary oocyte undergoes first meiotic division.
Also mention the products of this division.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 57/1/1.

Hints

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

Hint 1

List the follicle stages in order: primary, secondary, tertiary, Graafian.

Hint 2

Meiosis I in oogenesis is unequal. One product is large and one is small.

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 primary oocyte completes its first meiotic division in the tertiary follicle (as it matures towards the Graafian follicle).

    1 mark

  2. This unequal division gives two haploid products: a large secondary oocyte, which keeps most of the cytoplasm, and a tiny first polar body.

    1 mark

Answer: Tertiary follicle; the products are the secondary oocyte and the first polar body

Where the marks are

  • Identifies the tertiary follicle (1 mark)
  • Secondary oocyte (½ mark)
  • First polar body (½ 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 paper2026 board paper, set 57/1/1: 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.