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Assertion (A): The… (Class 12 Biology SQP 2025-26, Q13)

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BiologyCBSE Class 12 · Sample paper, session 2025-26 · 1 mark · Assertion-reason

CBSE Class 12 Biology sample paper 2025-26: question 13

From the official CBSE sample question paper for 2025-26, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · Assertion-reasonCompetency-basedSexual Reproduction in Flowering Plants

Assertion (A): The ability of the pistil to recognise the pollen is the result of a continuous dialogue between pollen and pistil.
Reason (R): This electrical dialogue allows only compatible pollen to germinate.

  1. (A)Both A and R are true and R is the correct explanation of A.
  2. (B)Both A and R are true and R is not the correct explanation of A.
  3. (C)A is true but R is false.
  4. (D)A is False but R is true.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2025-26.

Hints

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

Hint 1

What mediates pollen–pistil interaction?

Hint 2

Check the word 'electrical' in R.

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 is true: pollen–pistil recognition involves continuous dialogue.

  2. R is false: the dialogue is mediated by chemical components of pollen and pistil, not electrical signals. Answer (C).

    1 mark

Answer: (C) A true, R false

Where the marks are

  • Identifies dialogue as chemical, so R false (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 paperSample paper 2025-26: 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.