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Unformatted text preview: Transpiration is regulated by opening and closing of stomata The Cohesion-Tension Theory Transpiration and the cohesion of water causes an upward flow of water from soil to roots to leaves The adhesion of water to walls of xylem cells also helps resist gravity Cohesion, Tension, and Adhesion in the Ascent of Water 90 % of dry matter in phloem is sugar (mainly sucrose) Aphid Stylet Aphid Sugars are transported in the phloem Root Pressure- the pressure that develops, due to osmosis, in living cells of a root, forcing water up the xylem Guttation- droplets of water that form on leaf margins in a humid environment as a result of water being pushed up the xylem by root pressure Imbibition- the process of water absorption by a dry substance or structure, causing it to swell...
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This note was uploaded on 02/07/2011 for the course BIO 114 taught by Professor Ritter during the Spring '09 term at Cal Poly.
- Spring '09