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Cambridge IGCSE Biology practice

Paper 4 structured question: Transpiration

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4

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3

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Topic

Transpiration

Exam-style question

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Paper 4Theory (Extended)3 marks

Plants transport water from roots to leaves through xylem vessels.

Description

Water transport in plants

Water moves up the xylem due to a process involving transpiration pull and cohesion between water molecules.

  1. a

    State what causes the transpiration pull in plants.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Explain how cohesion between water molecules helps water to move up the xylem.

    Aim for approximately 2 distinct marking points.

    [2]

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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]