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This lesson covers osmosis — a special type of diffusion involving water — as required by the AQA GCSE Combined Science Trilogy specification (8464). You need to understand the definition, the effects of osmosis on plant and animal cells and be able to describe and analyse the Required Practical investigation.
Osmosis is the movement of water molecules from a dilute solution (high water concentration) to a concentrated solution (low water concentration) through a partially permeable membrane.
More precisely:
Osmosis is the net movement of water molecules across a partially permeable membrane from a region of higher water potential to a region of lower water potential.
Key points:
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