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How many pollen grains and… (Class 12 Biology 2025, Q10)

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BiologyCBSE Class 12 · Board exam 2025, set 57/1/1 · 1 mark · MCQ

CBSE Class 12 Biology 2025: question 10

Set in the CBSE Class 12 board exam of 2025, paper 57/1/1, section A, question 10, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q10 · 1 mark · MCQSexual Reproduction in Flowering Plants

How many pollen grains and ovules are likely to be formed in the anther and the ovary of an angiosperm bearing 50 microspore mother cells and 50 megaspore mother cells respectively ?

  1. (A)100, 25
  2. (B)200, 50
  3. (C)50, 50
  4. (D)200, 100

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 57/1/1.

Hints

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

Hint 1

Meiosis gives four products.

Hint 2

Only one megaspore survives in each ovule.

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. Each microspore mother cell (MMC) undergoes meiosis to give 4 pollen grains, so pollen grains.

  2. Each megaspore mother cell (MMC) gives 4 megaspores, but only 1 is functional and one MMC lies in each ovule, so 50 ovules. The answer is option (B).

    1 mark

Answer: 200, 50, option (B)

Where the marks are

  • 200 pollen and 50 ovules (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Sexual Reproduction in Flowering Plants, one at a time, marked against the answer key and marking points.Back to the full paper2025 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.