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Mohit wants to… (Class 12 Biology SQP 2026-27, Q17B)

questionbuddy.in/q/cbse-12-biology-2026-27-sqp-q17b-mohit-wants-produce-hybrid-seeds

BiologyCBSE Class 12 · Sample paper, session 2026-27 · 2 marks · Very short answer

CBSE Class 12 Biology sample paper 2026-27: question 17(B)

From the official CBSE sample question paper for 2026-27, section B, question 17(B), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q17(B) · 2 marks · Very short answerCompetency-basedSexual Reproduction in Flowering Plants

Mohit wants to produce hybrid seeds in a plant in his field in which male and female flowers mature at the same time and are close together. Suggest one strategy to promote only desired cross pollination and justify your answer.

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

Recall the artificial hybridisation technique used by plant breeders.

Hint 2

What must be removed from a flower, and what must cover it, to stop unwanted pollen?

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. Strategy (emasculation and bagging): Mohit should remove the anthers from the flowers chosen as the female parent before they shed pollen. He should then cover these flowers with butter-paper bags. When the stigma becomes receptive, he should dust it with pollen from the chosen male parent and re-bag the flower.

    1 mark

  2. Justification: Emasculation prevents self-pollination, and bagging keeps out unwanted foreign pollen. As a result, only the desired cross fertilises the ovules, giving true hybrid seeds.

    1 mark

Answer: Emasculate the selected flowers, bag them, and pollinate them by hand with pollen from the chosen male parent. This prevents self-pollination and contamination, so only the desired cross forms seeds.

Where the marks are

  • Suggests emasculation followed by bagging and artificial pollination with the desired pollen (1 mark)
  • Justifies: prevents self/unwanted pollination, ensuring only the desired hybrid seeds form (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.