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Osmosis in Cells Some fab real time osmosis videos to set the mood! Group Starter Activity Mr and Mrs Martinez went on holiday to Acapulco for a few days. When they came back their favourite plant looked like this! Explain the changes in terms of water movement 5 days ago Today Why is osmosis important? Plants rely on the movement of water through them: Water always moves to areas of lower water concentration. Root hairs take in water from the soil by osmosis. Plants- Water moving in Water moves into a plant cell. The cell wall stops the cell from bursting. We say that the cell is turgid. Turgid cell. Vacuole is filling all the space and pushing against cell wall This is useful as it gives plant stems support Cell turgor pressure Plants- Water moving out When water moves out of the plant cell vacuole, by osmosis, it becomes flaccid Flaccid cell. Vacuole is much smaller and taking up less space If a lot of water leaves the cell, the cytoplasm starts to peel away from the cell wall and we say the cell has undergone plasmolysis. Plasmolysis Osmosis in Plant Cells Low water concentration outside the cell (ie concentrated solution outside) Equal water concentrations inside & out (ie equal solute concentrations inside & out) High water concentration outside the cell (ie pure water or dilute solution outside) Animals- Water moving in Animal cells have no cell wall to stop the swelling, just a flexible cell membrane. If an animal cells are put in pure water (HWC) they take in water by osmosis until they burst. haemolysed normal turgid then burst Animals- Water moving out If an animal cells are put in a concentrated solution (LWC) they lose water by osmosis until they become shrunken or haemolysed. haemolysed normal http://zoology.okstate.edu/zoo_lrc/biol1114/tutorials/Flash/Osmosis_Anima tion.htm Quick Quiz- Osmosis 1. What is a partially permeable membrane? A membrane that only lets small molecules through it 2. Which substance moves by osmosis? Water, H2O 3. What happens to plant cells that take up water by osmosis, and what do you call the cell? The cells become ‘full’ of water and are called turgid 4. What happens to plant cells that lose water by osmosis, and what do you call the cell? The cytoplasm comes away from the cell wall and the cells are called plasmolysed. 5. What does ‘haemolysed’ mean? How does it happen? Animals cells which have lost water become shrunken and are called haemolysed. Now try your osmosis practice problems!