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List any two pairs of… (Class 10 Science 2024, Q23a)

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ScienceCBSE Class 10 · Board exam 2024, set 31/3/1 · 2 marks · Very short answer

CBSE Class 10 Science 2024: question 23(a)

Set in the CBSE Class 10 board exam of 2024, paper 31/3/1, section B, question 23(a), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q23(a) · 2 marks · Very short answerHeredity

List any two pairs of visible contrasting characters of garden pea plants used by Mendel for his experiments stating the dominant and recessive characters in each pair.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/3/1.

Hints

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

Hint 1

Think of the height of the plant and the seed traits Mendel studied.

Hint 2

The trait that shows in the F1 generation is the dominant one.

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. Pair 1, plant height: Tall is dominant.

    ½ mark

  2. Dwarf (short) is recessive.

    ½ mark

  3. Pair 2, seed colour: Yellow seed is dominant.

    ½ mark

  4. Green seed is recessive. (Other valid pairs: round/wrinkled seeds, violet/white flowers.)

    ½ mark

Answer: Tall (dominant) / dwarf (recessive); yellow seed (dominant) / green seed (recessive)

Where the marks are

  • Tall dominant, dwarf recessive (½ + ½ mark)
  • Yellow seed dominant, green seed recessive, or any other correct pair (½ + ½ mark)

Revise the chapter

  • Chapter: Heredity (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Heredity, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/3/1: 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.