Osmosis is the diffusion of water molecules across a partially permeable membrane from an area of high water potential to an area of lower water potential.
Pure water has the highest WP
Animal Cell:
Hypotonic - higher WP than cell, net movement into cell, cell bursts.
Isotonic - same WP, net movement equal, cell stays the same.
Hypertonic - lower WP than cell, net movement out of cell, cell shrinks.
Plant Cell:
Hypotonic - net movement into cell, cell becomes turgid.
Isotonic - net movement is equal, cell stays the same.
Hypertonic - net movement out of cell, cell plasmolysed.
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