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Answer the following. (Science 2025 31/5/1 Q30)

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ScienceCBSE Class 10 · Board exam 2025, set 31/5/1 · 3 marks · Short answer

CBSE Class 10 Science 2025: question 30

Set in the CBSE Class 10 board exam of 2025, paper 31/5/1, section C, question 30, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q30 · 3 marks · Short answerHow do Organisms Reproduce?

Answer the following.

  1. (a)

    Define fertilisation.

    0 marks
  2. (b)

    What happens to Zygote, Ovule, Ovary and Stamens after fertilisation in a flowering plant?

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/5/1.

Hints

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

Hint 1

Fertilisation joins two cells to make one new cell; name that cell.

Hint 2

Follow each part after fertilisation: which becomes the seed, which the fruit, and which parts are no longer needed?

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. (a) Fertilisation is the fusion of the male gamete with the female gamete to form a zygote.

    1 mark

  2. (b) Zygote: divides repeatedly to form the embryo inside the ovule.

    ½ mark

  3. (b) Ovule: develops a tough coat and becomes the seed.

    ½ mark

  4. (b) Ovary: grows rapidly and ripens to form the fruit.

    ½ mark

  5. (b) Stamens: wither (shrivel) and fall off, along with the petals and sepals.

    ½ mark

Answer: (a) Fusion of male and female gametes to form a zygote; (b) zygote → embryo, ovule → seed, ovary → fruit, stamens wither and fall off.

Where the marks are

  • Correct definition of fertilisation (1 mark)
  • Zygote forms embryo (½ mark)
  • Ovule forms seed (½ mark)
  • Ovary forms fruit (½ mark)
  • Stamens wither and fall off (½ 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 31/5/1: 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.