exam3-311Dsp08key - Dr. Reichler's Bio 311D class time:_...

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Page 1 of 2 Dr. Reichler’s Bio 311D class time:_________ Print Name:____Key____________________ _ Exam #3 April 2, 2008 Read each question carefully and don’t hesitate to ask if a question seems unclear. If possible, answer each question in the space provided, but if needed, continue on the back. If you use a drawing as part of your answer, be sure to also include a written explanation. These questions have specific answers, although for some, more than one answer is possible. To receive full credit you must clearly and fully answer the question being asked. The points for each question are noted in parentheses totaling 103 points. 1. What two problems might a plant with reduced lignin have? Why would reduced lignin lead to these problems? (10 pts) Reduced strength, lignin crosslinks cellulose making it stronger. Reduced water transport, lignin makes xylem (vessels) waterproof allowing water transport and/or makes xylem cells stronger to support water transport. 2. Would high temperature and high levels of CO 2 have additive or opposite affects on stomata aperture? Why? (10 pts) Opposite. High temperature would induce stomata to open to allow transpirational cooling (unless the high temp. is combined with low water) while high CO
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exam3-311Dsp08key - Dr. Reichler's Bio 311D class time:_...

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