CAIE IGCSE Biology 3.2.2 Osmosis Through Partially Permeable Membranes
Practise recognising osmosis and predicting net water movement through partially permeable membranes between solutions or cells.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- state that osmosis is the diffusion of water through a partially permeable membrane
- predict net water movement from higher water potential to lower water potential in a diagram
- explain a biological example by linking solute concentration, water potential and membrane permeability
3.2.2—Water diffuses through partially question 1
[Maximum number: 2]
Some students investigated osmosis in raw potato sticks.
The students followed the same experimental procedure with boiled potato sticks and found no overall change in mass in any of the solutions.
Suggest why the mass of the boiled potato sticks remained the same.
protein denatured (when cooked) ;
cell membrane, damaged/destroyed (when cooked) ;
no osmosis will occur ;
R killed proteins
I killed / denatured, cells
I damaged cell wall
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