1. Osmosis: the diffusion of water molecules through a selectively permeable membrane. Water moves from high to low concentration. Is the membrane permeable to the water or the solute? How can you tell? Osmosis

3. Tonicity: Determines the direction of water movement due to osmosis. Hypertonic: the solution with a greater concentration of the solute. –A cell would lose water and shrink if it is placed in a hypertonic solution. –Plasmolysis: when the cell membrane of a plant cell pulls away from the cell wall. –Causes the plant to wilt due to a lack of osmotic pressure. Osmosis

4. Tonicity: Determines the direction of water movement due to osmosis. Hypertonic: the solution with a greater concentration of the solute. –A cell would lose water and shrink if it is placed in a hypertonic solution. –Plasmolysis: when the cell membrane of a plant cell pulls away from the cell wall. –Causes the plant to wilt due to a lack of osmotic pressure. Osmosis

5. Hypotonic: the solution with the lesser concentration of the solute. –A cell would gain water and swell if it is placed in a hypertonic solution. –Cytolysis: when a cell bursts because of osmotic pressure. –Turgor Pressure: the pressure created when the cell membrane pushes against a cell wall. Osmosis

6. Isotonic: concentration of the solute is the same on both sides of the membrane (equilibrium). –Cells will stay the same size in a isotonic solution, there is no net movement of water molecules. Osmosis http://www.glencoe.com/sites/common_ass ets/science/virtual_labs/LS03/LS03.html

7. CELL 10% NaCL 90% H 2 O 20% NaCL 80% H 2 O What is the direction of water movement?

8. Cell in Hypertonic Solution CELL 15% NaCL 85% H 2 O 5% NaCL 95% H 2 O What is the direction of water movement? ENVIRONMENT