16) Water Potential

16) Water Potential - AP Biology Water Potential To survive...

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AP Biology Water Potential - To survive plants must balance water uptake and loss, osmosis determines the net uptake or water loss by a cell. - Osmosis = The movement of water from high concentration to low concentration; concentration does not refer to how much solutes are added; it rather refers to the concentration of solutes (sugars) - Water potential determines the movement of water in plants (balance of water) 1) Water Potential = a measurement of the sum of effects of pressure potential and solute potential that determines the movement of water in the plants (Ψ = Ψ p + Ψ s ) a) Pressure potential = physical pressure on a solution (+, 0, or -) b) Solute (Osmotic) potential = the number of dissolved solute molecules (- or 0) c) MPa is used for units of water potential d) Water moves from high water potential to low water potential e) For instance, if P = 0.5 MPa and S = -0.3 MPa, the resulting is 0.2 MPa. f)
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16) Water Potential - AP Biology Water Potential To survive...

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