BIOL 1030 Lecture Notes - Lecture 32: Root Pressure, Tracheid, Water Potential

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BIOL 1030 Full Course Notes
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BIOL 1030 Full Course Notes
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Water is moved into the roots, up the trunk to the leaves, then evaporates off the leafs. Sugars move from leaves to roots by phloem to parenchyma cell. Water and minerals are transported in the xylem vessels and tracheid"s: direction is upward from root to leaf, 2 mechanisms. Water and minerals (xylem sap) is pulled up the plant under tension due to transpiration (loss of water by evaporation from leaf surface via open stomata) Water column does not break because of the cohesion of water molecules. Because of adhesion of h2o molecules to the vessel and tracheid cell wall. Symbol for water potential is the greek letter psi: : a measure of the tendency of water to move along its concentration gradient. Is most commonly measured in mega pascal (mpa: pure water = 0 . Humidity and wind can affect atmosphere . Water molecules are connected by cohesion, so when one moves they all move.

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