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Cambridge IGCSE Biology practice

Paper 3 structured question: Diffusion

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3

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1

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Diffusion

Exam-style question

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Paper 3Theory (Core)1 marks

Diffusion in biological systems

Description

Diffusion definition

Diffusion is the overall movement of particles from areas of higher concentration to areas of lower concentration due to their random motion.

  1. a

    State what diffusion is.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Diffusion

Paper 3Theory (Core)2 marks

Description

Diffusion process

Particles move from an area of higher concentration to an area of lower concentration due to their random motion.

  1. a

    Describe what causes particles to move during diffusion.

    Aim for approximately 2 distinct marking points.

    [2]