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Osmosis 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 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 High water potential means there are few solute particles dissolved in it – eg. Fresh water from the tap. 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 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. Osmosis A dilute (weak) solution is hypotonic Osmosis A dilute (weak) solution is hypotonic A concentrated (strong) solution is hypertonic Osmosis A dilute (weak) solution is hypotonic A concentrated (strong) solution is hypertonic Two solutions with the same concentration are isotonic. 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. Osmoregulation Is the control of water inside a cell or organism Osmoregulation Is the control of water inside a cell or organism An animal cell: - Shows no change in isotonic solution 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 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 Osmoregulation in Plant cells Show no change in isotonic solution 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. 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. 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
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