Cambridge IGCSE Biology
3.1Diffusion
Diffusion in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic22 practice questions1 lesson
Learning objectives
What the syllabus expects you to be able to do.
- 3.1.1Describe diffusion as the net movement of particles down a concentration gradient as a result of their random movement, powered by their kinetic energy.
- 3.1.2State that some substances cross cell membranes by diffusion and describe why the diffusion of gases and solutes matters to organisms.
- 3.1.3Investigate how surface area, temperature, concentration gradient and distance affect diffusion.
Lessons
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Diffusion and active transport
24 min
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Sample question
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