Test 2 Material

Test 2 Material - Test 2 Material: Water Relations: Water...

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Test 2 Material: Water Relations: Water Vapor density/saturated water vapor density x 100 = relative humidity Isosmotic- equal water flowing in and out Hyperosmotic- more water out than in. water flows in, more solute in organism than environment. Hypoosmotic- more water in than out. water flows out, more solute in environment. Plants- excess water = anaerobic effects, buildup of NH4, H2S, CH4 Animals- drown, lose insulation/nests Water potential- free energy of solution relative to pure water. dagger thing – pure water = 0 dagger thing + pure water + solutes = -x hypotonic --> hypertonic water = high water potential --> lower potential Components- osmotic- solutes matric- adhesion pressures- + and – pressure Pure water = 0 megapascals dry air = -100 megapascals SPAC- soil, pressure, air continuum Guttation- root pressure forces h2o out of leaves animals- food and drink, absorption, h2o gain. lost by evap, secretion sharks- trimethyl amine oxide- urea in cells, hyperosmotic, water diffuses in Most marine invertebrates are isoosmotic. Osmoregulation takes energy. Bony fish- hypoosmotic- fish lose water, and take in salt water, excreting salt through urine, MgSO4 Fresh water- gills take IN water and salt Plant adaptations- water balance, input through roots, out through stomates, reg by stomates Avoidance/tolerance- short growth cycle, dormancy, succulence (CAM), phreatophyte (roots deep under) Thick cuticles, small stomates, sunken stomates, pubescence, leaf rolling Water use efficiency. Poikilohydric- water status changes with humidity- resurrection fern Animal adaptations- input from food drink metabolism, output in urine feces breathing, reg through excretion Avoidance/tolerance- migration, dormancy, nocturnal, opportunity, reduced sweat glands, SA/V ratio, longer loop of henle to absorb water Kangaroo rat- moisture cannot exit nose. strong urine, dry feces, nocturnal, metabolic water only, dry
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This note was uploaded on 04/09/2008 for the course BIOL 317 taught by Professor Crawford during the Spring '07 term at VCU.

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Test 2 Material - Test 2 Material: Water Relations: Water...

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