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(a) Explain how the proteins… (Class 10 Science 2025, Q24)

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ScienceCBSE Class 10 · Board exam 2025, set 31/3/1 · 2 marks · Very short answer

CBSE Class 10 Science 2025: question 24

Set in the CBSE Class 10 board exam of 2025, paper 31/3/1, section B, question 24, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q24 · 2 marks · Very short answerHeredity

(a) Explain how the proteins control the 'characteristics' in an organism with the help of an example of 'tallness' trait in pea plant.

(b) Name the section of DNA that controls the 'characteristics' in an organism.

  1. (a)

    Explain how the proteins control the 'characteristics' in an organism with the help of an example of 'tallness' trait in pea plant.

    0 marks
  2. (b)

    Name the section of DNA that controls the 'characteristics' in an organism.

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/3/1.

Hints

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

Hint 1

Tallness in pea is due to a hormone; what makes the hormone?

Hint 2

Enzymes are proteins whose information lies in a part of DNA.

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) The height of a pea plant depends on the amount of a plant hormone it makes. This hormone is produced by an enzyme (a protein). If the gene gives an efficient enzyme, more hormone is made and the plant is tall; if the gene is altered and the enzyme is less efficient, less hormone is made and the plant is short. So proteins (enzymes) coded by genes control characteristics.

    1 mark

  2. (b) The section of DNA that provides information for a protein and controls a characteristic is called a gene.

    1 mark

Answer: (a) Gene → enzyme (protein) → amount of growth hormone → tallness; (b) Gene

Where the marks are

  • Links gene → efficient enzyme → more hormone → tall plant (1 mark)
  • Names gene (1 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 paper2025 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.