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Cambridge IGCSE Combined Science practice

Paper 3 structured question: Diffusion

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Diffusion

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Paper 3Theory (Core)3 marks

Consider the effects of different solutions on plant cells.

Description

Plant Cells in Solutions

Plant cells can be placed in isotonic, hypotonic, or hypertonic solutions, affecting their turgor pressure and overall health.

  1. a

    Describe the effect of placing plant cells in a hypertonic solution.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Diffusion

Paper 3Theory (Core)2 marks

Description

Diffusion Process

Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. It occurs in liquids and gases and does not require energy.

  1. a

    Explain how diffusion helps cells maintain homeostasis.

    Aim for approximately 2 distinct marking points.

    [2]