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A researcher observes… (Class 12 Biology SQP 2026-27, Q1)

questionbuddy.in/q/cbse-12-biology-2026-27-sqp-q1-researcher-observes-particular-flowering-plant

BiologyCBSE Class 12 · Sample paper, session 2026-27 · 1 mark · MCQ

CBSE Class 12 Biology sample paper 2026-27: question 1

From the official CBSE sample question paper for 2026-27, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQCompetency-basedSexual Reproduction in Flowering Plants

A researcher observes that in a particular flowering plant, the pistil matures several days before the stamens in all flowers of the plant. What is the most significant consequence of this timing difference?

  1. (A)It guarantees self-pollination
  2. (B)It promotes autogamy
  3. (C)It ensures cross-pollination
  4. (D)It leads to geitonogamy

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

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

Hint 1

Ask whether the stigma can get pollen from its own anthers at the time it is receptive.

Hint 2

This is a device that discourages self-pollination.

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. When the pistil matures before the stamens (protogyny, a form of dichogamy), the stigma is receptive while the anthers of the same plant have not yet released pollen.

  2. The stigma can therefore only receive pollen from another plant, so self-pollination is prevented and cross-pollination is ensured. Option (C).

    1 mark

Answer: (C) It ensures cross-pollination

Where the marks are

  • Identifies that the time gap between pistil and stamen maturity prevents selfing and ensures cross-pollination (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 2026-27: 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.