BIO203H5 Chapter Notes - Chapter 3: Water Potential, Potential Gradient, Concentration Cell

104 views6 pages
28 Nov 2013
School
Department
Course

Document Summary

3 (ch37 - water and sugar transport in plants) Water movement along potential energy gradients from areas of high water potential to areas of low water potential. Water"s potential energy in plants is a combination of movement in response to differences in solute concentration the pressure exerted on the water. Plants do not expend energy to replace water lost through transpiration. Instead, water moves from soil and roots to leaves along a water potential gradient. Gradient exists because water at air-water surface in leaves is under negative pressure (tension) Negative pressure -> great enough to pull water up from roots through xylem. Water loss (transpiration) is a side effect of photosynthesis. Stomata cannot control loss of water vapor during photosynthetic co2 uptake. Without replacement, cells will dry out and die. Movement of water from roots to leaves passive process -> no expenditure of atp!

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related textbook solutions

Related Documents

Related Questions