BIOL1401 Chapter 9

BIOL1401 Chapter 9 - Chapter 9 Water in Plants Diffusion...

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Unformatted text preview: Chapter 9 Water in Plants Diffusion Movement of molecules from a region of higher concentration to a region of lower concentration – Molecules move along concentration gradient. – Moving from lower to higher concentration is against concentration gradient. – State of equilibrium - Molecules distributed throughout available space – Rate of diffusion depends on pressure, temperature and density of medium. Osmosis - Diffusion of water through a semi-permeable membrane from a region where water is more concentrated to a region where it is less concentrated (passive Transport) The key to remember about osmosis is that water flows from the solution with the lower solute concentration into the solution with higher solute concentration. Hypotonic Solution Hypertonic Solution isotonic Solution Osmotic pressure - Pressure required to prevent osmosis Osmotic potential balanced by resistance of cell wall. • Water potential of cell ( Ψ w ) = osmotic potential Ψ П + pressure potential Ψ p – Pressure potential (Turgor Pressure) - Pressure that develops against walls as result of water entering cell – Turgid cell - Firm cell due to water gained by osmosis Turgid cell Plasmolysis - Loss of water through osmosis Accompanied by shrinkage of protoplasm away from the cell wall...
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This document was uploaded on 10/27/2011 for the course BIOL 1401 at Texas Tech.

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BIOL1401 Chapter 9 - Chapter 9 Water in Plants Diffusion...

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