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The plant hormone whose… (Class 10 Science 2025, Q9)

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ScienceCBSE Class 10 · Board exam 2025, set 31/1/1 · 1 mark · MCQ

CBSE Class 10 Science 2025: question 9

Set in the CBSE Class 10 board exam of 2025, paper 31/1/1, section A, question 9, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q9 · 1 mark · MCQControl and Coordination

The plant hormone whose concentration stimulates the cells to grow longer on the side of the shoot which is away from light is:

  1. (A)Cytokinins
  2. (B)Gibberellins
  3. (C)Adrenaline
  4. (D)Auxins

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

Hints

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

Hint 1

Think about phototropism in shoots.

Hint 2

Adrenaline is an animal hormone, so it can be ruled out.

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 light falls on one side of a shoot, auxin diffuses to the shaded side.

  2. Auxin makes the cells on the shaded side grow longer, so the shoot bends towards light. The answer is option (D).

    1 mark

Answer: Auxins, option (D)

Where the marks are

  • Chooses option (D) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Control and Coordination, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 31/1/1: 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.