Test 3 Review

Test 3 Review - 1Biology 1202 Review Questions for Third...

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1Biology 1202 Review Questions for Third Exam Fall, 2007 Chapter 36 and 38 Vocabulary : proton pump, co-transport, turgor pressure, water potential, back pressure, solute pressure, mycorrhizae, endodermis, root pressure, transpirational pull, bisexual vs. unisexual flowers, incomplete flowers, pericarp, transgenic plants. 1. Understand how proton pumps and co-transport are important for movement of molecules and ions across plant cell membranes. Proton pumps actively transport H+ out, anions and solutes in. 2. Understand what water potential and turgor pressure mean. Why do water molecules flow to more negative water potentials? How is back pressure and solute pressure involved? Be able to predict water flow based on Wp and Ws. a. Figure 36.6 Water relations of plant cells 3.What is guttation? Explain how water potential difference drives water flow from roots, up the trunk, and into and out of leaves. Be familiar with the general values of water potential involved. Figure 36.13 Know that we’re always going towards a negative water potential. 4.How are guard cells and stomata involved in regulating the movement of gases and water in and out of leaves? What molecular mechanism causes stomata to open or close? Figure 36.15: Know guard cells open when turgid, stomata opens to allow more CO2 to go in…… 5. What two mechanisms are involved in transport of sugars from leaves to roots? Figure 36.18 Translocation of Phloem Sugars: increased osmotic pressure (reduced water potential) draws water in and increased hydrostatic pressure causes sucrose to flow to sink. 6.Describe the series of steps that occur as sperm fertilize the ovule in the plant ovary. What is the endosperm and why is it important? What develops into the seed? The fruit? Figure 38.1 Simplified Overview of angiosperm life cycle. 7. Give an example of a plant variety produced by crossing, artificial selection and
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This note was uploaded on 12/02/2009 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Test 3 Review - 1Biology 1202 Review Questions for Third...

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