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Osmosis in Plant Cells

OCR AS-level BiologyPlasma MembraneLesson 18 of 18

Plant cells contain various solutes in the cytoplasm.

Some of the solutes are dissolved in the large central vacuole.

Some plant cells are normally in a medium of almost pure water.

Diagram

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Key terms in this lesson

osmosis
The net movement of water molecules from a region of higher water potential to a region of lower water potential through a selectively permeable membrane.
water potential
A measure of the tendency of water molecules to move out of a solution; pure water has a water potential of zero and adding solute lowers it.

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