Exam2AKey - Biology 220 Exam 4 Summer 2009 Name_Key (A) _...

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Biology 220 Exam 4 Name____________ Key (A) ____________ Summer 2009 TA_______________________________ 1 1. (3 pts) Give one piece of evidence that the cotyledons are not initiated by the SAM. -The cotyledons are formed in the embryo before the SAM is visible. -stm mutants have cotyledons, but no SAM 2. (6 pts) Match the following terms to the labeled tissues. Use each letter once. ___ F __ ground tissue __ D ___ secondary xylem made in the late summer or fall __ A ___ secondary phloem __ C ___ bark __ B ___ vascular cambium __ E __ wood made during the most recent year of secondary growth C A B D E F
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Biology 220 Exam 4 Name____________ Key (A) ____________ Summer 2009 TA_______________________________ 2 3. (12 pts) Your colorblind friend ordered and installed a sheet of colored window glass for his remote cabin. He ordered red glass, but now wonders if maybe he received blue or green glass by mistake. You tell him to plant cucumber seeds next to his window. What would the appearance of cucumber seedlings be growing next to the window if the glass was each of the following colors? Assume that all seeds germinated at the same time. Be sure to describe characteristics that would allow him to distinguish between all three colors. Red: Seedlings would be short, cotyledons would be fully expanded and dark green. The seedlings would grow straight up. Green: Seedlings would be etiolated. They would be very long, pale, and the cotyledons would be folded over. They would grow straight, but may flop over because the stems are not sturdy. Blue: Seedlings would be long and relatively pale, though they may have some greening of the folded cotyledons. However, these seedlings would bend toward the window. 4. (3 pts) A dwarf (short) plant could have defects in the synthesis of any of the following hormones except A) auxin B) brassinosteroids C) gibberellin D) jasmonic acid 5. (3 pts) Which of the following does not occur during embryogenesis in plants? A) apical-basal axis established B) metabolic processes shut down C) radial patterning established D) reproductive cell lineage established 6. (3 pts) LEAFY is a master regulator controlling which developmental switch? A) embryonic growth to vegetative growth
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Exam2AKey - Biology 220 Exam 4 Summer 2009 Name_Key (A) _...

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