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GCSE Combined Science · key term
A membrane that allows some substances to pass through but prevents others from passing through.
Used by AQA and Edexcel
Specification 4.1.3.2, 4.1.3.3 · Paper 1
A membrane that allows some substances, such as water, to pass through but prevents other substances from passing through.
Revise: OsmosisOsmosis is the diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane. It does not require energy released by respiration.
Paper 1, Paper 2
A barrier that allows some substances to pass through but prevents others from passing through.
Revise: Transport in CellsOsmosis is the net movement of water molecules from a dilute solution to a more concentrated solution through a partially permeable membrane. It does not require energy from respiration.
A complete definition of osmosis must mention water, movement from a dilute to a concentrated solution, and a partially permeable membrane.
For osmosis, identify water, a partially permeable membrane and movement from a dilute to a concentrated solution.
In an osmosis explanation, name water, a partially permeable membrane and the direction of net water movement.
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