IGCSE Biology Notes: Transport in Cells
IGCSE biology notes on transport must separate diffusion, osmosis, and active transport — students often merge definitions in exams.
Hub: IGCSE biology notes · Movement in/out of cells.
Comparison table for your notes
| Process | Needs energy? | Needs membrane proteins? | Example |
|---|---|---|---|
| Diffusion | No | No | CO₂ into leaf |
| Osmosis | No | No (water) | Root water uptake |
| Active transport | Yes | Yes | Ion uptake in gut |
Add water potential bullet if on Extended syllabus.
Practical notes
Summarise potato/osmosis practical: independent variable, control, conclusion in osmotic terms.
Frequently asked questions
Is osmosis diffusion?
Note: osmosis is diffusion of water only — write precisely.
Plant transport next?
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