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How is the movement of… (Class 10 Science 2024, Q23A)

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

CBSE Class 10 Science 2024: question 23(A)

Set in the CBSE Class 10 board exam of 2024, paper 31/1/1, 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 answerLife Processes

How is the movement of leaves of a sensitive plant different from the downward movement of the roots ?

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

Hints

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

Hint 1

What stimulus makes the leaves fold, and what makes roots grow down?

Hint 2

Ask whether each movement needs growth and whether it depends on the direction of the stimulus.

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. Difference 1: In the sensitive plant the stimulus is touch. The roots move downward in response to gravity.

    1 mark

  2. Difference 2: The leaf movement of the sensitive plant involves no growth; it happens through changes in water content of cells. It is also non-directional (nastic). The downward root movement is a growth movement (geotropism). It is directional, depending on the direction of the stimulus.

    1 mark

Answer: Sensitive plant: touch stimulus, no growth, non-directional; Roots: gravity stimulus, growth involved, directional

Where the marks are

  • Correct difference in stimulus (touch vs gravity) (1 mark)
  • Correct difference in growth or directionality (1 mark)

Revise the chapter

  • Chapter: Life Processes (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Life Processes, one at a time, marked against the answer key and marking points.Back to the full paper2024 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.