678 moderate the movements of mimosa pudica involve

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Nastic Movements and Solar Tracking; p. 678; moderate The movements of Mimosa pudica involve changes in the pulvini. False 18. Nastic Movements and Solar Tracking; p. 680; easy Regular rubbing or bending of a stem stimulates its elongation. False 19. Nastic Movements and Solar Tracking; p. 681; easy The mechanism underlying heliotropism involves pulvini at the base of leaves and leaflets. True Essay Questions 1. The Tropisms; pp. 660–662; moderate Describe the mechanism by which coleoptiles bend toward the light. Support your answer with experimental evidence. 2. The Tropisms; pp. 664–665; moderate What is hydrotropism? What evidence supports the hypothesis that hydrotropism is not simply a form of gravitropism? 3. Circadian Rhythms; pp. 665–667; easy In what ways is the circadian clock useful to plants? 4. Photoperiodism; pp. 668–669; moderate Define photoperiodism. Distinguish between short-day, long-day, and day-neutral plants. In what
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ways are the first two names misnomers? 5. Photoperiodism; pp. 670–672; difficult Describe the photoconversion reactions of phytochrome. Use these reactions to explain why a lettuce seed exposed first to red light and then to far-red light will not germinate. 6. The Floral Stimulus; p. 674; difficult What type of molecule is florigen? Where in the plant is it synthesized, how is it transported, and how does it exert its effects? 7. Vernalization: Cold and the Flowering Response; p. 674; moderate Describe the procedure of vernalization. In what ways is it economically important? 8. Dormancy; pp. 674–676; moderate How is dormancy adaptive in an evolutionary sense? Describe some mechanisms that have evolved to break seed dormancy. 9. Nastic Movements and Solar Tracking; p. 678; easy How is a nastic movement different from a tropism? 10. Nastic Movements and Solar Tracking; p. 678; moderate What is a pulvinus? How do pulvini function in nastic movements? Give some examples. 11. Nastic Movements and Solar Tracking; p. 680; easy What is thigmomorphogenesis, and in what ways is it adaptive?
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