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Published byRolf McBride Modified over 9 years ago
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Why can salt cause a water deficit in plants even though the soil has plenty of water?
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Given that the plant cell in the picture is maintaining a constant volume, what can you deduce about the water potential of the plant cell and the solution in the beaker?
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Water Potential Plant cell in an aqueous solution. The water potential of the cell equals that of surrounding solution at dynamic equilibrium.
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From AP Biology Exam Equation Sheet Water Potential ( ) p + s p = pressure potential s = solute potential The water potential will be equal to the solute potential of a solution in an open container, since the pressure potential of the solution in an open container is zero. The Solute Potential of the Solution s = –iCRT i = ionization constant (for sucrose this is 1.0 because sucrose does not ionize in water) C = Molar concentration R = Pressure constant (R = 0.0831 liter bar/mole K T = Temperature Kelvin (273 + °C)
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