Quiz 1 Review

Quiz 1 Review - Quiz Brief review: 1. Total water potential...

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Unformatted text preview: Quiz Brief review: 1. Total water potential = solute (osmotic) potential and pressure potential Osmotic potential is related to the amount (number) of solutes in the solution. Always negative. Pressure can be positive or negative 2. Transpiration is the driver for long distance water transport in plants. A. Transpiration rate = G X C 1. (G) the mole fraction gradient measures the environmental force driving evaporation. vp in - vp out G = Atmospheric pressure 2. ( C) conductance: how freely water can pass from the inside to the outside of the leaf. II. Roots-where water enters the plant Roots live in the soil, where water potential is the highest. Water moves from the soil to the roots. A. structure of root in XS: First structure water encounters in the root surface, the epidermis with elongate root hairs. B. Types of short distant transport: (How does water get from the soil to the vascular cylinder?) Water encounters a root hair or epidermal cell. 1. apoplastic: movement of substances (water) from cell to cell only through the APOPLAST: cell walls and intercellular spaces 2. symplastic: movement of substances (water) from cell to cell through the SYMPLASM (cytoplasm continuum from cell to cell) a. The change from apoplastic to symplastic transport requires that the substance pass through the cell (= plasma) membrane at least once. b. Membranes can exhibit selectivity to ions and small molecules. Membrane selectivity is important for excluding harmful mineral ions. c. water movement from apoplast to symplast First structure water encounters in the root surface, the epidermis with elongate root hairs. B. Types of short distant transport: (How does water get from the soil to the vascular cylinder?) Water encounters a root hair or epidermal cell. 1. apoplastic: movement of substances (water) from cell to cell only through the APOPLAST: cell walls and intercellular spaces 2. symplastic: movement of substances (water) from cell to cell through the SYMPLASM (cytoplasm continuum from cell to cell) a. The change from apoplastic to symplastic transport requires that the substance pass through the cell (= plasma) membrane...
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This test prep was uploaded on 04/07/2008 for the course BIOL 108 taught by Professor Jones/smith during the Spring '08 term at UConn.

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Quiz 1 Review - Quiz Brief review: 1. Total water potential...

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