UNI101Y1 Study Guide - Transpiration, Cost, Alanine
16 Feb 2013
School
Department
Course
Professor
Document Summary
As soils dry, the remaining water is held tighter b/c a greater proportion lies close to the surfaces of soil particles. Most crop plants can extract water from soils with water pot. down to -1. 5mpa. Drought-adapted species can from even drier soils. Wwiillttiinngg ccooeeffffiicciieenntt (wwiillttiinngg ppooiinntt) is a water potential of -1. 5mpa. At lower water pot. , plants wilt even if some water remains. Ssoolluutteess are dissolved substances in water which influence the diffusion of water molecules. Water tends to move from regions of low solute conc. to regions of high solute conc. Oossmmoossiiss is the process whereby the fluid in a cell has a high conc. of ions and other solutes (thus a low water potential), water tends to move from the envmt into the cell. Oossmmoottiicc ppootteennttiiaall is the force with which an aqueous soln attracts water by osmosis.
