Diffusion PowerPoint: AQA GCSE Biology Revision

A one-topic revision summary for AQA GCSE Biology Paper 1, Cell Biology. It defines diffusion as net movement down a concentration gradient, explains the factors that affect its rate, gives real examples in the lungs, small intestine, muscles and liver, and shows why surface area to volume ratio matters for larger organisms.

• 6 slides
• AQA GCSE Biology Paper 1
• Revision summary
• Exam tips included
• Fully editable

Download this PowerPoint free (.pptx)

What the PowerPoint covers

1. What diffusion is: a clear definition with a labelled diagram of particles crossing a membrane.
2. Factors affecting the rate: concentration gradient, diffusion distance, temperature and surface area.
3. Diffusion in the body: oxygen and carbon dioxide in the lungs, glucose in the small intestine, and more.
4. Surface area to volume ratio: worked cube examples and why large organisms need exchange surfaces.
5. Key vocabulary and exam tips: net movement, equilibrium, Fick’s law and how to word answers.

Who it is for

GCSE biology and combined science students (Foundation and Higher) revising Cell Biology, and teachers who want a ready made summary for a recap starter, homework or revision lesson. Written for the AQA specification, and just as useful for other exam boards.

Download this PowerPoint free (.pptx)