Transcript Osmosis in Plant Cells

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Osmosis in Plant Cells
• Plant cells are structurally more complex.
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Plant Cells and Osmosis
Vacuole fills
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Osmosis in Plant Cells
• Plant cells are structurally more complex.
• They are surrounded by a cellulose cell wall
which is…
– Freely permeable to water
– Inelastic
– Able to resist cell expansion
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Osmosis in Plant Cells
• Plant cells are structurally more complex.
• They are surrounded by a cellulose cell wall
• They contain a large permanent vacuole
which…
– Contains a solution of salt, sugars and ions
– Is bound by a selectively permeable membrane
– Exchange water by osmosis with the solution
surrounding the cell
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Osmosis in Plant Cells
Cell wall
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Osmosis in Plant Cells
Cell wall
Cell membrane
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Osmosis in Plant Cells
Cell wall
Cell membrane
Cytoplasm
Vacuole
Vacuole
membrane
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Osmosis in Plant Cells
• If placed in a less concentrated solution…
Water enters the
vacuole by osmosis
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Osmosis in Plant Cells
• If placed in a less concentrated solution…
Vacuole swells,
pushing the
cytoplasm against the
cell wall
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Osmosis in Plant Cells
• If placed in a less concentrated solution…
The inelastic cell wall
resists expansion
and the cell becomes
rigid, or TURGID. It
can be described as
in a state of
TURGOR
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Osmosis in Plant Cells
• If placed in a more concentrated solution…
Water leaves the
vacuole by osmosis
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Osmosis in Plant Cells
• If placed in a more concentrated solution…
The vacuole shrinks
pulling the cytoplasm
away from the cell
wall
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Osmosis in Plant Cells
• If placed in a more concentrated solution…
Membrane peeling away from the cell wall
The cell is now
PLASMOLYSED or is in a
state of PLASMOLYSIS