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Unformatted text preview: For gas exchange needed in photosynthesis Close at night to conserve water when photosynthesis is not occurring Transparent epidermis Allows light to penetrate into middle of leaf, where photosynthesis occurs Air spaces in mesophyll tissue Permit rapid diffusion of CO2 and water into (and oxygen out of) mesophyll cells, Transpiration Loss of water vapor from aerial parts of plants Occurs primarily through stomata Rate of Transpiration Affected by enviornmental factors Temperature Wind Relative humidity Effects of Trasnpiration Both beneficial and harmful to plant Trade-off between Co2 and water conservation Leaf Abscission Loss of Leaves As winter approaches in temperate climates At beginning of dry period in tropical climates with wet and dry seasons Complex process Physiological and anatomical changes occur prior to leaf fall....
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- Spring '08