Edexcel IGCSE Biology · Spec 2.17
Diffusion and Non-Living Membrane Practicals
Covers investigate diffusion using agar cubes, Investigate osmosis through a non-living membrane and Identify variables, measurements and improvements.
Biology revision video
Diffusion and Non-Living Membrane Practicals
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Spec 2.17
What you need to know
- Investigate diffusion using agar cubes
- Investigate osmosis through a non-living membrane
- Identify variables, measurements and improvements
Active recall
Quick check
Answer each question before opening the answer.
What does the agar-cube investigation demonstrate?
Diffusion and the effect of surface area-to-volume ratio
Why must Visking tubing be blotted before weighing?
To remove external water that would falsely increase the measured mass
Why calculate percentage mass change?
It allows samples with different starting masses to be compared fairly
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