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Water potential & fl

For 330 Water potential and flow, many from Taiz & Zeiger 2002

TermDefinition
Bulk flow Movement of groups of molecules en masse, most often in response to a pressure gradient; also referred to as , mass flow.
Capillarity Movement of water along a capillary tube due to surface tension; also known as caplary action.
Diffusion Net movement of particles from high to low concentration due to random thermal agitation.
Flaccid cell A plant cell having a turgor pressure near zero.
Hydrogen bonds Weak electrostatic attraction between water molecules.
Matric potential A component of water potential caused by the adhesion of water molecules to insoluble solids.
Osmosis Spontaneous net movement of solvent molecules through a semi-permeable membrane in the direction that tends to equalize the solute concentrations on the two sides
Osmotic potential The effect of dissolved solutes on water potential; also known as solute potential.
Pressure potential The positive hydrostatic pressure within cells; also referred to as turgor pressure
Selectively permeable Allows movement of water and other small uncharged substances more readily than the movement of larger solutes and charged substances; also known as semi-permeable.
Solvent Able to dissolve other substances.
Surface tension The attraction of molecules at the surface of a liquid.
Transpiration Water movement through stomata from plants to the atmosphere.
Turgid cell A swollen plant cell exerting positive pressure against the cell wall.
Turgor pressure Positive hydrostatic pressure within plant cells; also referred to as pressure potential.
Water potential The potential energy of water relative to pure water at standard conditions
Created by: mdcoleman
 

 



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