Skip to content

Name the place in… (Class 12 Biology SQP 2024-25, Q23)

questionbuddy.in/q/cbse-12-biology-2024-25-sqp-q23-name-place-human-ovary-where

BiologyCBSE Class 12 · Sample paper, session 2024-25 · 3 marks · Short answer

CBSE Class 12 Biology sample paper 2024-25: question 23

From the official CBSE sample question paper for 2024-25, section C, question 23, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q23 · 3 marks · Short answerHuman Reproduction

Name the place in human ovary where the first meiotic division is completed during oogenesis. What are the products of this division? Give the chromosome number of each type of cells involved in the process.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

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

Hint 1

Meiosis I in the female is completed only as the follicle matures.

Hint 2

The division is unequal in cytoplasm: one large cell and one small cell.

Hint 3

Meiosis I halves the chromosome number from the diploid 46.

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 first meiotic division is completed by the primary oocyte within the tertiary (Graafian) follicle of the ovary, just before ovulation.

    1 mark

  2. Products: the primary oocyte divides unequally to form a large haploid secondary oocyte and a tiny first polar body.

    1 mark

  3. Chromosome numbers: primary oocyte = 46 (diploid); secondary oocyte = 23 (haploid); first polar body = 23 (haploid).

    1 mark

Answer: In the primary oocyte inside the tertiary/Graafian follicle; products: secondary oocyte and first polar body; primary oocyte 46, secondary oocyte 23, polar body 23.

Where the marks are

  • Names the primary oocyte in the tertiary/Graafian follicle as the site (1 mark)
  • Names the products: secondary oocyte and first polar body (1 mark)
  • Gives chromosome numbers 46, 23 and 23 (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 2024-25: 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.