Bring together particle explanations and biological applications with this four-resource diffusion bundle from ZED Science Resources.

The collection covers factors affecting diffusion rate alongside examples of diffusion and exchange in living organisms. Related explanations revisit key ideas from different angles, supporting teaching, consolidation and revision.

Learning Objectives

• Describe diffusion as the net movement of particles down a concentration gradient.
• Explain how temperature, concentration gradient, surface area and diffusion distance affect diffusion.
• Explain oxygen and carbon dioxide exchange at the alveoli.
• Connect exchange-surface adaptations with their functions.
• Apply diffusion principles to animal and plant examples.

Bundle Overview

The factors-focused resources develop explanations using particle movement and concentration gradients, including how a larger surface area supports a greater rate of exchange.

The biological application resources explore where diffusion occurs, including the lungs, small intestine and leaves. Students connect large surface areas, thin exchange barriers and maintained concentration gradients with efficient exchange.

The resources contain overlapping coverage, allowing teachers to select explanations and activities appropriate to their class or revisit concepts during revision.

Suitable For

KS4 GCSE Biology and Combined Science students.

What’s Included

Four teaching resources:

• Diffusion and Exchange Surfaces – Alveoli, Villi and Leaves
• Factors Affecting Diffusion – Temperature, Concentration Gradient and Surface Area
• Factors Affecting Diffusion – Surface Area, Temperature and Concentration Gradient
• Where Does Diffusion Take Place? – Alveoli and Exchange Surfaces

Produced by ZED Science Resources.