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Cambridge IGCSE Biology practice

Paper 3 structured question: Diffusion

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Diffusion

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Paper 3Theory (Core)2 marks

Explaining the role of kinetic energy in diffusion

Diagram Description

Molecules in Random Motion

A diagram shows molecules moving in different directions randomly within a container, illustrating their kinetic energy.

  1. a

    State what causes the molecules to move randomly.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Identify how this random motion leads to diffusion.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Diffusion

Paper 3Theory (Core)2 marks

Description

Diffusion Energy Source

Diffusion is the movement of molecules and ions from an area of higher concentration to an area of lower concentration. This movement happens naturally without any external energy input.

  1. a

    State the source of energy that drives diffusion.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Identify why diffusion does not require external energy input.

    Aim for approximately 1 distinct marking point.

    [1]