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Unformatted text preview: AP Biology Transport of Water and Minerals (Transpiration)- Transpiration = The loss of water vapor from the plant body (mainly shoot systems) 1) From Root hairs → Xylem – Figure 1 a) Water and minerals are absorbed by either apoplastic routes or symplastic routes b) Regardless of the place where the substances are absorbed, they must pass through the transmembrane route c) This indicates that the substance in the apoplastic routes will be fused into the symplastic routes; this is mainly because of the Casparian strip d) Casparian strip = A belt made of suberin that forces water and minerals to cross the plasma membrane of an endodermal cell and enter the stele via the symplast e) As a result, endodermal cells and living cells in the stele will discharge water and minerals into the xylems f) Xylem has negative water potential because of the transpirational pull; the roots have positive water potentials; therefore the substances move from root hairs to the xylem 2) Xylem → Leaves: Pulling Xylem Sap: Transpiration Cohesion-Tension Mechanism...
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This note was uploaded on 02/11/2012 for the course ZOOLOGY 152 taught by Professor Stephengammie during the Fall '11 term at University of Wisconsin.
- Fall '11