Describe how light carbon dioxide and water loss

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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. Useful websites: • If you need to review osmosis and active transport: • “Active Transport” 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” has a series of interactive lessons on material movement. • Animations of transport in plants: • “Guard cell function” is a simple animation of how stomata open and close. • “Transpiration” is a guided tutorial with simple animations. • “Transpiration” is a very simple animation of water moving through plant tissue. • “Sucrose transport” 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.

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