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Explain the mechanism… (Class 10 Science SQP 2025-26, Q11B)

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ScienceCBSE Class 10 · Sample paper, session 2025-26 · 2 marks · Very short answer

CBSE Class 10 Science sample paper 2025-26: question 11(B)

From the official CBSE sample question paper for 2025-26, section A, question 11(B), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q11(B) · 2 marks · Very short answerLife Processes

Explain the mechanism by which the water is transported in plants?

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2025-26.

Hints

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

Hint 1

Name the tissue that carries water.

Hint 2

Think of a push from below (roots) and a pull from above (leaves).

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. Water and minerals move upward in one direction through the xylem (tracheids and vessels), which forms a continuous channel from roots to leaves.

  2. Root pressure: Root cells actively take up ions from the soil. This makes the ion concentration in the root higher than in the soil. Water therefore moves into the root, and a steady column of water is pushed up the root xylem. This matters most at night.

    1 mark

  3. Transpiration pull: Water evaporates from the leaves through the stomata. This creates a suction that pulls water up through the xylem from the roots. It is the main force in the daytime.

    1 mark

Answer: Water moves up through the xylem, driven by root pressure (active ion uptake by roots) and mainly by transpiration pull from the leaves.

Where the marks are

  • Explains root pressure from active ion uptake causing water to enter the root xylem (1 mark)
  • Explains transpiration pull through xylem vessels and tracheids (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 paperSample paper 2025-26: 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.