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Transcript
NAVRACHANA UNIVERSITY Osmosis in Plant Cells • Plant cells are structurally more complex. NAVRACHANA UNIVERSITY Plant Cells and Osmosis Vacuole fills NAVRACHANA UNIVERSITY 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 NAVRACHANA UNIVERSITY 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 NAVRACHANA UNIVERSITY Osmosis in Plant Cells Cell wall NAVRACHANA UNIVERSITY Osmosis in Plant Cells Cell wall Cell membrane NAVRACHANA UNIVERSITY Osmosis in Plant Cells Cell wall Cell membrane Cytoplasm Vacuole Vacuole membrane NAVRACHANA UNIVERSITY Osmosis in Plant Cells • If placed in a less concentrated solution… Water enters the vacuole by osmosis NAVRACHANA UNIVERSITY Osmosis in Plant Cells • If placed in a less concentrated solution… Vacuole swells, pushing the cytoplasm against the cell wall NAVRACHANA UNIVERSITY 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 NAVRACHANA UNIVERSITY Osmosis in Plant Cells • If placed in a more concentrated solution… Water leaves the vacuole by osmosis NAVRACHANA UNIVERSITY Osmosis in Plant Cells • If placed in a more concentrated solution… The vacuole shrinks pulling the cytoplasm away from the cell wall NAVRACHANA UNIVERSITY 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
