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During artificial… (Class 12 Biology SQP 2025-26, Q17A)

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BiologyCBSE Class 12 · Sample paper, session 2025-26 · 2 marks · Very short answer

CBSE Class 12 Biology sample paper 2025-26: question 17(A)

From the official CBSE sample question paper for 2025-26, section B, question 17(A), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q17(A) · 2 marks · Very short answerSexual Reproduction in Flowering Plants

During artificial hybridization, it is important to ensure that only desired pollen grains are used for pollination. How is it ensured?

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

Think of two steps: one stops the flower's own pollen, the other stops outside pollen.

Hint 2

One step uses forceps on the anthers; the other uses a butter-paper cover.

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. Emasculation: If the female parent has bisexual flowers, the anthers are removed from the flower bud with forceps before they dehisce. This stops self-pollination by the flower's own pollen.

    1 mark

  2. Bagging: The emasculated flower is covered with a bag of suitable size, usually made of butter paper. This keeps unwanted pollen off the stigma. When the stigma becomes receptive, the desired pollen is dusted on it and the flower is re-bagged.

    1 mark

Answer: By emasculation (removing anthers before dehiscence) followed by bagging (covering with butter-paper bag) to prevent contamination by unwanted pollen.

Where the marks are

  • Explains emasculation – removal of anthers before dehiscence (1 mark)
  • Explains bagging – covering the flower with butter-paper bag to avoid unwanted pollen (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.