01:119:116 Lecture Notes - Lecture 10: Stoma, Ground Tissue, Guard Cell
3 Apr 2016
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Document Summary
Ability of plants to gather resources from environment. Ability to transport gathered minerals to where they are needed. Balancing trade off between: maximizing photosynthetic products + minimizing h2o loss. Absorption of h2o + mineral ions (dissolved in h2o) Regulates movement of h2o + minerals into xylem. Band like region surrounding each endodermal cell (exterior to endodermal cell) Indirectly sa of root absorption. Free energy of water: amount of water energy available to do work. = 0 mpa for pure water at sea level + room temperature. More potential energy to do work when h2o moves. Solute ions and molecules bind to h2o reduces motion of h2o molecules reduces capacity to do work. H2o moves from psi region (less negative) psi (more negative) region. H2o moves from hypotonic (less solute) hypertonic (more solute) Will always be negative (very negative or less negative) cuz pure water = 0. Negative cuz of dissolved solutes in adsorbed h2o.
