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GCSE Biology · key term
The overall movement remaining after particle movements in opposite directions have been considered.
Used by AQA, Edexcel and OCR
Specification 4.1.3.1 · Paper 1
The overall movement that remains after particle movements in opposite directions are taken into account.
Revise: Principles and Factors of DiffusionThis process is diffusion: the spreading out of the particles of any substance in a solution, or particles of a gas, resulting in a net movement from an area of higher concentration to an area of lower concentration.
Specification 1.16 · Paper 1, Paper 2
The overall movement resulting when particles move in both directions but more move in one direction than the other.
Revise: Osmosis InvestigationAlthough water moves in both directions, there is a net movement from the more dilute solution towards the more concentrated solution.
Specification B2.1a · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Transport in cellsThe resulting overall movement is called net movement.
Use the phrase net movement: particles move randomly in both directions, but overall more move from higher to lower concentration.
When explaining a mass change, name both osmosis and the direction of the net movement of water across the cell membranes.
For each process, state the substance, its direction of net movement, whether a membrane is required and whether energy from respiration is needed.
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