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We need to water the soil in… (Class 10 Science 2024, Q23a)

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ScienceCBSE Class 10 · Board exam 2024, set 31/4/1 · 2 marks · Very short answer

CBSE Class 10 Science 2024: question 23(a)

Set in the CBSE Class 10 board exam of 2024, paper 31/4/1, 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

We need to water the soil in plants on a regular basis. But it ultimately reaches the leaves of the plant. Explain how this takes place.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/4/1.

Hints

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

Hint 1

Which tissue carries water in plants?

Hint 2

What happens to water at the leaf surface, and how does this affect the water below it?

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. The roots absorb water from the soil. This water enters the xylem vessels, which form a continuous channel from the roots through the stem to the leaves.

    1 mark

  2. Water evaporates from the leaves through the stomata (transpiration). This creates a suction force called the transpiration pull, which pulls the water column up through the xylem from the roots to the leaves.

    1 mark

Answer: Water absorbed by the roots moves up through the xylem, pulled by the suction (transpiration pull) created by loss of water from the stomata of the leaves.

Where the marks are

  • Water is absorbed by the roots and conducted through continuous xylem (1 mark)
  • Transpiration through stomata creates a suction/transpiration pull that draws water up (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 31/4/1: 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.