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Biology - Day 31.docx

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BIOL 1130

Biology Day 31 Monday November 26, 2012 Plant Biology Transpiration – water is lost by evaporation at the leaf surface. - Stoma – must be open to lose water - Wp will be made lower by active transport of K ions into the guard cells - Causes the cells to become turgid and the small openings (stoma) are evident - Requires active transport Need ATP from photosynthesis - 1 corn plant transpires an average of 15 L/week - Roughly 150,000 L/hectare/day - For stoma to close  K ions flow out of the guard cells  Wp outside is lower and H 2 flows out of guard cells and stoma are closed Guttation - Method of relieving Water pressure in the plant xylem during darkness - Specialized cells – hydathunder  located at tips of leaves of specific plants - Releases liquid H 2 onto leaf surface Transport of Sugars Under pressure Flow Hypothesis - Sugars flow from the source (leaves) to where needed (sink) Source - Sugars enter sieve tube by active transport (needs energy) - Will cause Wp to decrease and H 2 flows into the tubes - This increases the turgor pressure Sink - Location where sugars will be removed (actively) - Causes the Wp to decrease outside the sieve tubes and H2O flows out and H 2 diffuses back to the xylem Mineral Nutrition - Nutrients enter the roots and move to the endodermis by passive transport - Must cross the endodermis (casparian strip) against a concen
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