Cambridge IGCSE Biology practice

Paper 3 structured question: Diffusion

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Paper

Marks

Topic

Diffusion

Exam-style question

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Paper 3Theory (Core)1 marks

Diffusion is a process that allows substances to move across the cell membrane.

Description

Oxygen enters cells and carbon dioxide leaves cells by diffusion across the cell membrane.

a
State the process by which oxygen enters cells.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 3Theory (Core)2 marks

Diagram Description

Diagram shows oxygen moving into a cell and carbon dioxide moving out of a cell through the cell membrane.

a
Identify one substance that enters cells by diffusion and one substance that exits cells by diffusion.
Your answer
Aim for approximately 2 distinct marking points.
[2]