1. Osmosis

2.  The movement of water across a semi-permeable membrane from an area of high water potential, to an area of low water potential until water potentials are equal.  http://www.youtube.com/watch?v=AYNwynwaALo http://www.youtube.com/watch?v=AYNwynwaALo  The movement of water across a semi-permeable membrane from an area of high water potential, to an area of low water potential until water potentials are equal.  http://www.youtube.com/watch?v=AYNwynwaALo http://www.youtube.com/watch?v=AYNwynwaALo

3. Osmosis  The movement of water across a semi-permeable membrane from an area of high water potential, to an area of low water potential until water potentials are equal.  http://www.youtube.com/watch?v=AYNwynwaALo http://www.youtube.com/watch?v=AYNwynwaALo  High water potential means there are few solute particles dissolved in it – eg. Fresh water from the tap.  The movement of water across a semi-permeable membrane from an area of high water potential, to an area of low water potential until water potentials are equal.  http://www.youtube.com/watch?v=AYNwynwaALo http://www.youtube.com/watch?v=AYNwynwaALo  High water potential means there are few solute particles dissolved in it – eg. Fresh water from the tap.

4. Osmosis  The movement of water across a semi-permeable membrane from an area of high water potential, to an area of low water potential until water potentials are equal.  http://www.youtube.com/watch?v=AYNwynwaALo http://www.youtube.com/watch?v=AYNwynwaALo  High water potential means there are few solute particles dissolved in it – eg. Fresh water from the tap.  Sea water has many particles of salt dissolved in it, therefore the water potential is low.  The movement of water across a semi-permeable membrane from an area of high water potential, to an area of low water potential until water potentials are equal.  http://www.youtube.com/watch?v=AYNwynwaALo http://www.youtube.com/watch?v=AYNwynwaALo  High water potential means there are few solute particles dissolved in it – eg. Fresh water from the tap.  Sea water has many particles of salt dissolved in it, therefore the water potential is low.

5. Osmosis  A dilute (weak) solution is hypotonic

6. Osmosis  A dilute (weak) solution is hypotonic  A concentrated (strong) solution is hypertonic  A dilute (weak) solution is hypotonic  A concentrated (strong) solution is hypertonic

7. Osmosis  A dilute (weak) solution is hypotonic  A concentrated (strong) solution is hypertonic  Two solutions with the same concentration are isotonic.  A dilute (weak) solution is hypotonic  A concentrated (strong) solution is hypertonic  Two solutions with the same concentration are isotonic.

8. Osmosis  A dilute (weak) solution is hypotonic  A concentrated (strong) solution is hypertonic  Two solutions with the same concentration are isotonic.  Diffusion and osmosis mean that particles move in both directions across the membrane, however the net direction is towards the area of lower concentration.  A dilute (weak) solution is hypotonic  A concentrated (strong) solution is hypertonic  Two solutions with the same concentration are isotonic.  Diffusion and osmosis mean that particles move in both directions across the membrane, however the net direction is towards the area of lower concentration.

9. Osmoregulation  Is the control of water inside a cell or organism

10. Osmoregulation  Is the control of water inside a cell or organism  An animal cell: - Shows no change in isotonic solution  Is the control of water inside a cell or organism  An animal cell: - Shows no change in isotonic solution

11. Osmoregulation  Is the control of water inside a cell or organism  An animal cell: - Show no change in isotonic solution - Shrivel up in hypertonic solution  Is the control of water inside a cell or organism  An animal cell: - Show no change in isotonic solution - Shrivel up in hypertonic solution

12. Osmoregulation  Is the control of water inside a cell or organism  An animal cell: - Show no change in isotonic solution - Shrivel up in hypertonic solution - Expand & burst in hypotonic solutions  Is the control of water inside a cell or organism  An animal cell: - Show no change in isotonic solution - Shrivel up in hypertonic solution - Expand & burst in hypotonic solutions

13. Osmoregulation in Plant cells  Show no change in isotonic solution

14. Osmoregulation in Plant cells  Show no change in isotonic solution  Become plasmolysed in hypertonic solutions – where water drains from the vacuole and the membrane pulls away from the cell wall = the cells become flaccid and the plant wilts.  Show no change in isotonic solution  Become plasmolysed in hypertonic solutions – where water drains from the vacuole and the membrane pulls away from the cell wall = the cells become flaccid and the plant wilts.

15. Osmoregulation in Plant cells  Show no change in isotonic solution  Become plasmolysed in hypertonic solutions – where water drains from the vacuole and the membrane pulls away from the cell wall = the cells become flaccid and the plant wilts.  Become firm in hypotonic solution – turgid. The cell wall stops the cell bursting and the plant remains upright.  Show no change in isotonic solution  Become plasmolysed in hypertonic solutions – where water drains from the vacuole and the membrane pulls away from the cell wall = the cells become flaccid and the plant wilts.  Become firm in hypotonic solution – turgid. The cell wall stops the cell bursting and the plant remains upright.

16. Osmoregulation in Plant cells  Show no change in isotonic solution  Become plasmolysed in hypertonic solutions – where water drains from the vacuole and the membrane pulls away from the cell wall = the cells become flaccid and the plant wilts.  Become firm in hypotonic solution – turgid. The cell wall stops the cell bursting and the plant remains upright. **Pages 120 & 121 in BIOZONE  Show no change in isotonic solution  Become plasmolysed in hypertonic solutions – where water drains from the vacuole and the membrane pulls away from the cell wall = the cells become flaccid and the plant wilts.  Become firm in hypotonic solution – turgid. The cell wall stops the cell bursting and the plant remains upright. **Pages 120 & 121 in BIOZONE