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Pressure raises water potential. 5. When working problems, use zero for pressure potential in animal cells & open beakers. 6. 1 bar ...
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Osmosis & Plant cells
Plants can use the potential energy in water to perform work. Tomato plant regains turgor pressure – cell pushes against wall due to uptake of water
P
S Or Water = pressure + solute Potential potential potential
S Solute potential is also called the osmotic potential because solutes affect the direction of osmosis. S of any solution at atmospheric pressure is always negative – why? Answer = less free water molecules to do work
P
P is the physical pressure on a solution.
P can be negative transpiration in the xylem tissue of a plant (water tension)
P can be positive water in living plant cells is under positive pressure (turgid)
Pure water is the standard. Pure water in an open container has a water potential of zero at one atmosphere of pressure.
Water Potential: an artificial model (b) adding +0.23 pressure with plunger no net flow of water (c) applying +0.30 pressure increases water potential solution now has of +0. Water moves right to left
(d) negative pressure or tension using plunger decreases water potential on the left. Water moves from right to left
(a) Flaccid cell placed in hypertonic solution Water potential is out of cell plasmolysis
Need solute concentration Use the equation
S = - iCRT i = # particles molecule makes in water C = Molar concentration R = pressure constant 0.0831 liter bar mole o K T = temperature in degrees Kelvin = 273 + o C