Post on 15-Aug-2015
Year 8 ScienceDiffusion
Dr Lakshmi Sharma
Lesson Objective: To understand the process of diffusion & its relationship to living organisms.
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What is Diffusion ?
DiffusionParticle net movement from;
a region of HIGH concentration to a region of LOW concentration
High Concentration
Movement of Particles to Low Concentration Diffused Throughout
Equilibrium Lakshmi Sharma Diffusion - Cell membranes and Transport
Think Waterfall !!!!
High Low
Lakshmi Sharma Diffusion - Cell membranes and Transport
Does the diagram below represent Diffusion ?
Discuss for 1 minute in pairs
Answer – Why or Why not is this diffusion?
Explain what is happening to the dye particles at each stage
Lakshmi Sharma Diffusion - Cell membranes and Transport
Lakshmi Sharma Diffusion - Cell membranes and Transport
Does Diffusion require Energy ?
Lakshmi Sharma Diffusion - Cell membranes and Transport
NO !!! Diffusion is a PASSIVE process
How Diffusion Works
• http://www.youtube.com/watch?v=VY0mZUDvbH4
Lakshmi Sharma Diffusion - Cell membranes and Transport
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 and Transport
Cell Membranes
Semi-PermeableCertain molecules can enter & leave the cell membrane-selective
High Concentration
Low Concentration
Nutrients
WasteCell
Lakshmi Sharma Diffusion - Cell membranes and Transport
Diffusion Across Cell Membranes
BEFORE DIFFUSION AFTER DIFFUSION
Lakshmi Sharma Diffusion - Cell membranes and Transport
Revision
1. Define Diffusion2. Why is Diffusion Important3. What does Semi-Permeable mean
Lakshmi Sharma Diffusion - Cell membranes and Transport
Extension – Further Knowledge
https://www.youtube.com/watch?v=RPAZvs4hvGA
Lakshmi Sharma Diffusion - Cell membranes and Transport
Look at the following youtube video on transport across the cell membrane.
Hope You Enjoyed The Lesson