This document is a lesson plan on diffusion taught by Dr. Lakshmi Sharma. It defines diffusion as the passive movement of particles from an area of high concentration to low concentration. Diffusion is important for biological systems as it allows for the exchange of nutrients, waste, and other molecules across semi-permeable cell membranes. The lesson includes diagrams, examples, and discussion questions to help students understand the process and significance of diffusion.

1. Year 8 Science
Diffusion
Dr Lakshmi Sharma
Lesson Objective:To understand
the process of diffusion & its
relationship to living organisms.
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2. What is Diffusion ?

3. Diffusion
Particle net movement from;
a region of HIGH concentration to a region of LOWconcentration
High Concentration
Movement of Particles
to Low Concentration
DiffusedThroughout Equilibrium
Lakshmi Sharma Diffusion - Cell membranes and Transport

4. ThinkWaterfall !!!!
High Low
Lakshmi Sharma Diffusion - Cell membranes and Transport

5. Does the diagram below represent Diffusion ?
Discuss for 1 minute in pairs
Answer –Why orWhy not is this diffusion?
Explain what is happening to the dye particles at each stage
Lakshmi Sharma Diffusion - Cell membranes and Transport

6. Lakshmi Sharma Diffusion - Cell membranes and Transport
Does Diffusion require Energy ?

7. Lakshmi Sharma Diffusion - Cell membranes and Transport
NO !!!
Diffusion is a PASSIVE process

8. How DiffusionWorks
• http://www.youtube.com/watch?v=VY0mZUDvbH4
Lakshmi Sharma Diffusion - Cell membranes and Transport

9. Why is Diffusion Important in Biological Systems?
 Using computers find out why diffusion is important
 Work in pairs
 5mins starting now
Lakshmi Sharma Diffusion - Cell membranes andTransport

10. Cell Membranes
Semi-Permeable
Certain molecules can enter & leave the cell membrane-selective
High Concentration
Low Concentration
Nutrients
Waste
Cell
Lakshmi Sharma Diffusion - Cell membranes andTransport

11. Diffusion Across Cell Membranes
BEFORE DIFFUSION AFTER DIFFUSION
Lakshmi Sharma Diffusion - Cell membranes andTransport

12. Revision
1. Define Diffusion
2.Why is Diffusion Important
3.What does Semi-Permeable mean
Lakshmi Sharma Diffusion - Cell membranes andTransport

13. Extension – Further Knowledge
https://www.youtube.com/watch?v=RPAZvs4hvGA
Lakshmi Sharma Diffusion - Cell membranes andTransport
Look at the following youtube video on transport across the
cell membrane.

14. HopeYou Enjoyed
The Lesson