1 A) Cytokinin B) Ethylene C) Abscisic acid D) Gibberellin 2 A) dormancy; abscisic acid B) abscission; ethylene C) senescence; cytokinins D) photoperiodism; auxins 3 A) Receptors B) Biological clock C) A transduction pathway D) Cellular response 4 A) protective sheath that covers roots B) in dicot plants, the covering for the cotyledon C) a protective sheath that covers the shoots D) an embryonic shoot system 5 A) cytokins B) gibberellins C) auxins D) Phytochrome 6 A) abscisic acid B) dioxin C) 2,4-D D) 2,4,5-T 7 A) Yellow. B) White C) Blue D) Red 8 A) Ethylene gas promotes abscission. B) Plants adjust their patterns of growth in response to environmental rhythms. C) The total of biological processes in plants leading to death is known as senescence. D) Plants do not have biological clocks. 9 A) inclusion of plants such as chrysanthemums and poinsettias B) they will not bloom if the dark period is interrupted by light C) they respond to short, dark periods, not long, light periods D) All of these 10 A) hormone. B) receptor. C) biological clock. D) transduction pathway. 11 A) An immature orange tree taken from Florida and planted in Iowa might begin to grow too soon and be killed by a late frost. B) A single stem exposed to an appropriate environment will go ahead and break dormancy, even though the rest of the plant remains dormant. C) Plants grow toward the light because they need light. D) Plants will grow in the dark for a limited time. 12 A) will not flower if their dark period is interrupted by light B) will not grow in the tropics C) will not reproduce in the tropics D) flower early in the spring or late fall 13 A) Thigmotropism B) Phototropism C) Gravitropism D) All of these 14 A) enhance fruit ripening and leaf abscission B) promote cell division and reduce leaf aging C) control bud and seed dormancy D) control gravitropism and phototropism 15 A) thigmotropism B) phototropism C) gravitropism D) All of these 16 A) abscisic acid B) ethylene C) gibberellin D) auxin 17 A) Thigmotropism B) Circadian rhythms C) Hypersensitive response D) Activation of phytochrome to phytochrome far-red 18 A) cyanogenic glycosides B) steroid glycosides C) proteinase inhibitors D) None of these are correct. 19 A) salicylic acid. B) taxol. C) alkaloids. D) none of these initiate the production of the anti-herbivore chemicals by defense genes in plants. 20 Pseudomyrinex ferruginea acacia and ants, the ants provided which of the following actions in return for being provided a home and food materials:A) Allowing would-be herbivores to sample parts of the plant to initiate pollination B) Attacking any would-be herbivores to protect the plant structure C) Pollinating the plant D) None of these
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