1. Osmosis in Plant Cells Plant cells are structurally more complex. NAVRACHANA UNIVERSITY

2. Plant Cells and Osmosis Vacuole fills NAVRACHANA UNIVERSITY

3. 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

4. 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

5. Osmosis in Plant Cells Cell wall NAVRACHANA UNIVERSITY

6. Osmosis in Plant Cells Cell wall Cell membrane NAVRACHANA UNIVERSITY

7. Cell wall Cell membrane Cytoplasm Vacuole membrane Vacuole NAVRACHANA UNIVERSITY Osmosis in Plant Cells

8. If placed in a less concentrated solution… Water enters the vacuole by osmosis Osmosis in Plant Cells NAVRACHANA UNIVERSITY Osmosis in Plant Cells

9. If placed in a less concentrated solution… Vacuole swells, pushing the cytoplasm against the cell wall NAVRACHANA UNIVERSITY Osmosis in Plant Cells

10. 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 Young plants, which have little woody tissue, rely on turgor for support against wind and gravity NAVRACHANA UNIVERSITY Osmosis in Plant Cells

11. If placed in a more concentrated solution… Water leaves the vacuole by osmosis NAVRACHANA UNIVERSITY Osmosis in Plant Cells

12. If placed in a more concentrated solution… The vacuole shrinks pulling the cytoplasm away from the cell wall NAVRACHANA UNIVERSITY Osmosis in Plant Cells

13. If placed in a more concentrated solution… The cell is now PLASMOLYSED or is in a state of PLASMOLYSIS Membrane peeling away from the cell wall No longer fully inflated with water, the cell loses its own support and becomes floppy or FLACCID. A non-woody plant which loses lots of water has many plasmolysed cells and as a result the plant WILTS NAVRACHANA UNIVERSITY Osmosis in Plant Cells