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| 1 | |
______________ is the gaseous hormone that promotes ripening and coloring of fruits. |
| | A) | Cytokinin |
| | B) | Ethylene |
| | C) | Abscisic acid |
| | D) | Gibberellin |
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| 2 | |
The shedding of plant parts is termed _______. |
| | A) | dormancy |
| | B) | abscission |
| | C) | senescence |
| | D) | photoperiodism |
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| 3 | |
Plant hormones function to _______. |
| | A) | produce responses only through differential growth and elongation of cells |
| | B) | act as auxins |
| | C) | have a generic response to allow multiple cell types to be affected |
| | D) | target specific cell types |
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| 4 | |
The plant structure, coleoptile refers to a(n) _______. |
| | 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 |
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| 5 | |
Which of the following is a man-made herbicide? |
| | A) | cytokins |
| | B) | gibberellins |
| | C) | auxins |
| | D) | All of these |
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| 6 | |
Agent Orange, a defoliant used in Vietnam, is synthesized from ________. |
| | A) | abscisic acid |
| | B) | dioxin |
| | C) | 2,4-D |
| | D) | 2,4,5-T |
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| 7 | |
__________ light initiates the greatest phototropic response in plants. |
| | A) | Yellow. |
| | B) | White |
| | C) | Blue |
| | D) | Red |
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| 8 | |
Which of these statements is false? |
| | 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. |
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| 9 | |
Long day plants are characterized by _______. |
| | 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 |
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| 10 | |
Long day plants are characterized by _______. |
| | 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 |
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| 11 | |
Which of these statements is NOT true? |
| | 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. |
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| 12 | |
Long day plants ________. |
| | 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 |
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| 13 | |
_________ is the plant growth response which promotes tendrils to wrap around supports. |
| | A) | Thigmotropism |
| | B) | Phototropism |
| | C) | Gravitropism |
| | D) | All of these |
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| 14 | |
In plants, the hormone cytokinin functions to ______. |
| | 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 |
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| 15 | |
Phytochrome far red controls ______. |
| | A) | thigmotropism |
| | B) | phototropism |
| | C) | gravitropism |
| | D) | All of these |
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| 16 | |
Foolish rice plants are developed from the action of the ___________ hormone. |
| | A) | abscisic acid |
| | B) | ethylene |
| | C) | gibberellin |
| | D) | auxin |
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| 17 | |
All of these are physical attacks against plants EXCEPT ______. |
| | A) | fungal attack through the stomata |
| | B) | nematodes breaking through the epidermis of a root and establishing a parasitic relationship |
| | C) | aphids' specially designed mouthparts attacking the phloem of the plant |
| | D) | All of these are physical attacks. |
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| 18 | |
After a leaf is injured, the plant produces __________, which destroys the digestive enzymes of the predator feeding on them. |
| | A) | cyanogenic glycosides |
| | B) | steroid glycosides |
| | C) | proteinase inhibitors |
| | D) | None of these are correct. |
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| 19 | |
The production of anti-herbivore chemicals by defense genes in plants such as tobacco and lettuce is initiated by: |
| | A) | salicylic acid. |
| | B) | taxol. |
| | C) | alkaloids. |
| | D) | none of these initiate the production of the anti-herbivore chemicals by defense genes in plants. |
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| 20 | |
In the mutualistic relationship between the 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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