Chapter 35

Chapter 35 - I ngrid Shih BIO 1306-04 18 March 2011 Chapter...

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Ingrid Shih BIO 1306-04 18 March 2011 Chapter 35 35.1 How Do Plants Take Up Water and Solutes? Osmotic pressure is the force applied the piston on the higher osmotic potential side in order to prevent osmosis o Osmosis is the movement of water through a membrane in accordance with the laws of diffusion Osmotic pressure has a positive value (e.g. mPa, mmHg, Atm, etc.) o Megapascals (MPa) are the units used to measure pressure potential Atm pressure is about .1, MPa or 14.7 lbs/in 2 Typical pressure in a car tire is about .2 MPa The tendency of a solution to take up water from pure water across a membrane is called water potential, represented by Ψ o Water potential is the sum of solute potential Ψ s and pressure potential Ψ p = Ψ Ψ s + Ψ p Negative value vacuum like force Water moves into higher osmotic potential/solute potential/osmotic pressure Higher [free water] higher water potential High osmotic potential/solute potential lower water potential
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Chapter 35 - I ngrid Shih BIO 1306-04 18 March 2011 Chapter...

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