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The number of chromosomes in… (Class 10 Science 2025, Q10)

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ScienceCBSE Class 10 · Board exam 2025, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2025: question 10

Set in the CBSE Class 10 board exam of 2025, paper 31/2/1, section A, question 10, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q10 · 1 mark · MCQHow do Organisms Reproduce?

The number of chromosomes in a cell division is halved. This kind of cell division is observed in :

  1. (A)Only testis
  2. (B)Only ovary
  3. (C)Ovary and testis both
  4. (D)All cells of the body

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/2/1.

Hints

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

Hint 1

Which division forms gametes?

Hint 2

Where are gametes produced in males and in females?

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 cell division that halves the chromosome number is meiosis. It forms gametes.

  2. Gametes are made in both sexes: eggs in the ovary and sperms in the testis. So the answer is (C), ovary and testis both.

    1 mark

Answer: (C) Ovary and testis both

Where the marks are

  • Chooses ovary and testis both, option (C) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from How do Organisms Reproduce?, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 31/2/1: 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.