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AQA Biology
Osmosis
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Osmosis
The diffusion of water particles from a
high
water concentration to
low
water concentration through a partially
permeable
membrane
Dilute solution
Contains a high concentration of
water
Contains a
low
concentration of
solute
(e.g. sugar)
Concentrated solution
Contains a
low
concentration of water
Contains a
high
concentration of
solute
(e.g. sugar)
Animal cell in water
Water moves into the cell by
osmosis
, causing the cell to expand and potentially
burst
Animal cell in concentrated solution
Water moves out of the cell by osmosis, causing the cell to
shrink
Plant cell in water
Water moves into the cell by
osmosis
, causing the cell to become
turgid
(swollen)
Plant cell in concentrated solution
Water moves out of the cell by
osmosis
, causing the cell to become
flaccid
(shrunken)
The cell wall prevents the plant cell from
bursting
when
water
moves in by osmosis