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Unformatted text preview: tension help draw water up the xylem.
• Explain how pressure differences created by transpiration at the leaves help draw water into the roots.
• Describe how light, carbon dioxide, and water loss control the function of the guard cells.
• Explain how aphids helped scientists study how phloem transports sugars.
• Define “source” and “sink,” and use these terms to describe how the pressure-flow process works. Use
Figure 24-25 as a guide.
• Read the last section on evolutionary connections. List some ways in which roots, leaves, and stems may
have been adapted to different purposes.
• If you need to review osmosis and active transport:
• “Active Transport” http://www.brookscole.com/chemistry_d/templates/student_resources/
shared_resources/animations/ion_pump/ionpump.html is an animation of the Sodium-Potassium pump
found in the membranes of nerve cells. It’s a good introduction to the concept.
• “Diffusion and Osmosis” http://www.phschool.com/science/biology_place/labbench/lab1/intro.html has a
series of interactive lessons on material movement.
• Animations of transport in plants:
• “Guard cell function” http://www.phschool.com/science/biology_place/labbench/lab9/stomamov.html is a
simple animation of how stomata open and close.
• “Transpiration” http://www.phschool.com/science/biology_place/labbench/lab9/concepts1.html is a
guided tutorial with simple animations.
• “Transpiration” http://www.kscience.co.uk/animations/transpiration.htm is a very simple animation of
water moving through plant tissue.
• “Sucrose transport” http://www.tvdsb.on.ca/westmin/science/sbioac/plants/sucrose.htm is a simple
animation that demonstrates the pressure-flow model....
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This document was uploaded on 02/25/2014 for the course BIOLOGY 103 at Western Oregon University.
- Winter '09