Chapter 27 - Chapter 27 Regulating Growth and Development...

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Chapter 27: Regulating Growth and Development: The Plant Hormones Multiple-Choice Questions 1. Introduction; pp. 603–604; easy; ans: e All plant hormones: a. are equally effective in free and bound forms. b. act in the tissues where they are produced. c. are stimulatory. d. are active in large quantities. e. communicate information. 2. Introduction; pp. 603–604; difficult; ans: d Which of the following statements about plant hormones is FALSE? a. The same hormone can elicit different responses in different tissues. b. The same hormone can elicit different responses at different times in the same tissue. c. A tissue’s response to a hormone depends on the sensitivity of the tissue to that hormone. d. All plant hormones can be classified into five groups. e. Hormones can exist in conjugated forms. 3. Introduction; p. 654; moderate; ans: a ______ are recently discovered polypeptides that activate chemical defenses against herbivores. a. Systemins b. Auxins c. Brassinolides d. Salicylic acids e. Jasmonates 4. Auxins; p. 605; easy; ans: b If a coleoptile tip is covered with a blackened glass tube then illuminated from the side, the coleoptile will: a. die. b. not bend. c. bend toward the light. d. bend away from the light. e. bend at right angles to the light.
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2 Chapter 27 Regulating Growth and Development: The Plant Hormones 5. Auxins; p. 606; easy; ans: c ______ is very similar to the amino acid tryptophan. a. Gibberellin b. Cytokinin c. Indoleacetic acid d. Abscisic acid e. Ethylene 6. Auxins; p. 606; difficult; ans: a Auxin is transported toward the ______ in stems, toward the ______ in leaves, and toward the ______ in roots. a. base; base; base b. tip; tip; tip c. base; base; tip d. base; tip; base e. tip; tip; base 7. Auxins; p. 606; moderate; ans: e Basipetal transport: a. refers to polar transport in general. b. refers to a type of nondirectional transport. c. can refer to transport in the stem from the soil surface toward the tip. d. can refer to transport in the root from the soil surface toward the tip. e. can refer to transport in the root from the tip toward the soil surface. 8. Auxins; p. 606; difficult; ans: c In stems, polar auxin transport occurs mainly in the: a. vessels only. b. sieve tubes only. c. vascular parenchyma cells only. d. vessels and sieve tubes. e. vessels and parenchyma cells. 9. Auxins; p. 606; difficult; ans: b A PIN protein: a. is an auxin influx carrier. b. is an auxin efflux carrier. c. catalyzes the conversion of auxin to tryptophan. d. catalyzes the conversion of auxin to indole. e. is a synthetic auxin.
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Chapter 27 Regulating Growth and Development: The Plant Hormones 3 10. Auxins; pp. 606–607; difficult; ans: c If wounding causes the destruction of vascular tissues in a herbaceous eudicot stem: a. replacement vascular tissues will not form under any conditions. b. replacement vascular tissues will form if IAA is added to the stem just below the wound.
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  • Fall '12
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