The movement of a substance from an area of high concentration to an area of low concentration of that substance.
Diffusionspeed depends on the temperature.
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Osmosis
= diffusion of water through a semipermeable membrane
= the movement of water from a place with a low osmotic pressure to a place with a high osmotic pressure
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Osmosis
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Osmosis in animal cells
hypotone solution OUTSIDE of the cell
water goes in by osmosis and the cells burst
isotone solution OUTSIDE of the cell
no osmosis, no difference in osmotic pressure
hypertone solution OUTSIDE of the cell
water leaves the cell through osmosis, the cells shrink
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osmosis in a plant cell
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Discussion #1
The plant cells in the hypotone solution absorbed water through the process of osmosis.
The osmotic pressure in the cells was larger then the surroundings of the cells. Osmosis is the movement of water from a low to a high osmotic pressure. The mass (length and width, firmness) got larger, because of this water entering the plant cells. These cell were now in turgor/turgid.
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Discussion #2
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The plant cells in the hypertone solution lost water through osmosis. Their surrounding was filled with a high osmotic pressure (high concentration). Thus water moves from the low osmotic pressure area(the cells) to the high osmotics pressure area (the surroundings). Thus plasmolysis happened
Lesson duration is: 60 min
