BIOL 225 Lecture 4: Bio 225 class 5

34 views4 pages

Document Summary

Diff mechanisms of transporting subs over short and long distances: Bulk flow: movement of fluid due to a pressure difference between 2 locations. Negative water potential : water moves from outside the root (soil) to inside the root. Hydrophobic substance: selects what will enter the xylem. Waxy strip of the endodermal wall ex: filters certain ions from enterig. Water goes to the xylem at night, Pressure driven bulk flow: moves water long distances through the xylem. Ascent of water through plants results from the decrease in water potential at the sites of evaporation within leaves. Long distant transport: done by bulk pressure (mvnt of water by pressure not concentration) Xylem sap is usually under negative pressure: how they move from the root to the shoot. Always goes from high to low potential : how water moves through the plant body (from root to shoot) 3% of water used by cell vs. 95% lost (mainly through the stomata)

Get access

Grade+
$40 USD/m
Billed monthly
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
10 Verified Answers
Class+
$30 USD/m
Billed monthly
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
7 Verified Answers

Related Documents

Related Questions