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CAIE IGCSE Biology 3.1.4 Importance of Diffusion Questions

Practise explaining how diffusion supplies cells with gases or dissolved substances and removes products such as carbon dioxide across exchange surfaces and cell membranes.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • explain why oxygen, carbon dioxide and solutes diffuse down concentration gradients across exchange surfaces or cell membranes to supply cells or remove products
  • trace gas diffusion through stomata, alveolar/capillary surfaces and cell membranes to supply cells or remove products

CAIE IGCSE Biology 3.1.4 Importance of Diffusion Questions question 1

[Maximum number: 1]

The diagram shows a section through an alveolus and through a capillary.

Figure for Question CAIE IGCSE Biology 3.1.4 Importance of Diffusion Questions question 1 — CAIE IGCSE Biology

How does carbon dioxide move from Y to X ?

A

by diffusion

B

by osmosis

C

by translocation

D

by transpiration

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