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Cambridge IGCSE Biology practice

What causes the upward movement of water in the xylem?

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MCQ

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cambridge_mcq

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Topic

Transpiration

Exam-style question

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What causes the upward movement of water in the xylem?.

  1. A.Active pumping by root cells
  2. B.Transpiration pull from water evaporation
  3. C.Gravity pulling water upward
  4. D.Osmosis through the leaf surface

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Paper 4 structured question: Transpiration

Paper 4Theory (Extended)4 marks

Diagram Description

Diagram of water movement in a plant

The diagram shows water molecules moving upward through xylem vessels from the roots to the leaves. Water evaporates from the leaf surfaces, creating a pulling force.

StepProcess
1Water evaporates from the leaf surfaces.
2A pulling force called transpiration pull is created.
3Water molecules stick together by cohesion.
4A continuous column of water is pulled up through the xylem.
  1. a

    Explain how water moves upward in the xylem due to transpiration pull and cohesion.

    Aim for approximately 4 distinct marking points.

    [4]