Osmosis is the diffusion of water molecules across a partially permeable membrane, from an area of high water potential, to an area of low water potential
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What is the water potential for pure water?
0
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What lowers the water potential of a liquid?
Adding solutes lowers the water potential. The more negative the water potential, the stronger the concentration of solutes
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What is meant by the term 'isotonic'?
Isotonic refers to when two solutions have the same water potential, so there's no net movement of water molecules
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What is meant by the term 'hypotonic'?
Solutions with a higher water potential compared with the inside of a cell are called hypotonic. If a cell is placed in a solution with a higher water potential, it will swell as water moves in by osmosis
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What is meant by the term 'hypertonic'?
Solutions with a lower water potential compared with inside the cell are called hypertonic. If a cell is placed in a solution with a lower water potential, it will shrink as water moves out by osmosis
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What are the 3 factors affecting the rate of osmosis?
1)Water potential gradient, 2) Thickness of the exchange surface, 3) Surface area of the exchange surface
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What are the 3 main steps for finding out the water potential of plant tissue?
1)Making serial dilutions (dilutions that decrease in concentration by the same factor each time), 2)Measuring the change in mass, 3)Producing a callibration curve
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