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| 1 . |
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A friend of yours is experiencing menopausal symptoms. You suggest that, rather than going to the doctor, she might first want to incorporate tofu into her diet. Although you were wrong to discourage her from going to the doctor, you were correct that she might want to eat more tofu. Why? (33.0) [Hint]
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| 2 . |
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You are interested in determining what part of a plant is sensitive to light for phototropism. A good first experiment would be to ____________. (33.1) [Hint]
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| 3 . |
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What do auxin, cytokinins, gibberellins, abscisic acid, and ethylene have in common? (33.2) [Hint]
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| 4 . |
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Which of these hormones does not affect cell differentiation? (33.2) [Hint]
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| 5 . |
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According to the hypothesis discussed in your text, the immediate, direct effect of auxin in cell elongation is to _____. (33.3) [Hint]
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| 6 . |
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At lower concentrations, auxin _____; at higher concentrations, auxin _____. (33.3) [Hint]
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| 7 . |
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An auxin concentration that will inhibit root cell elongation may be in the range that will _____. (33.3) [Hint]
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| 8 . |
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Which of these hormones are produced by the apical meristems of buds? (33.3) [Hint]
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| 9 . |
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In shoots, branching is inhibited by _____ from the tip of a growing shoot, but this effect is countered by _____ from the roots. (33.4) [Hint]
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| 10 . |
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A graduate student growing plant cells in a laboratory dish wants them to _____, so the student treats them with cytokinins. (33.4) [Hint]
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| 11 . |
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If you want your plants to branch more, you can spray them with _____. (33.4) [Hint]
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| 12 . |
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Which of the following hormones, produced in the root tips, is(are) required for normal growth? (33.4) [Hint]
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| 13 . |
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You have just bought freshly cut flowers, only to learn that your guests are going to be running late. You tell yourself that this will not be a problem; all you have to do is spray _____ on the flowers to keep them fresh. (33.4) [Hint]
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| 14 . |
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As leaf lettuce matures, the basal edible leaves suddenly send up a tall flowering shoot. After the plant bolts like this, it no longer produces broad, tasty leaves. Suppose you want to prevent bolting so that you can harvest lettuce longer. You may want to prevent the plant from synthesizing _____. (33.5) [Hint]
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| 15 . |
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Gibberellins work along with _____ to stimulate cell elongation and division in stems. (33.5) [Hint]
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| 16 . |
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Many seeds that require exposure to light or cold temperatures can be induced to germinate when sprayed with _____. (33.5) [Hint]
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| 17 . |
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Commercially, gibberellin-auxin sprays are used to _____. (33.5) [Hint]
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| 18 . |
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_____ promote(s) seed germination and _____ inhibit(s) seed germination. (33.6) [Hint]
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| 19 . |
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Seeds of many desert plants will not germinate until a heavy rain washes away their _____. (33.6) [Hint]
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| 20 . |
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ABA enables a plant to withstand drought by _____. (33.6) [Hint]
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| 21 . |
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The abscission layer _____. (33.7) [Hint]
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| 22 . |
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In the autumn, the amount of ____ increases and the amount of ____ decreases in leaf stalks, causing a plant to drop fruit and leaves. (33.7) [Hint]
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| 23 . |
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The plant hormone ethylene has three or four of the following characteristics. Which one, if any, of these features is NOT characteristic of ethylene? If all of these characteristics apply to ethylene, choose answer (5). (33.7) [Hint]
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| 24 . |
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If you want to promote the ripening of a green banana, you should _____. (33.7) [Hint]
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| 25 . |
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Which of these environmental toxins is a by-product of the synthesis of the herbicide 2,4-D? (33.8) [Hint]
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| 26 . |
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Dioxin has been demonstrated to cause _____ in laboratory animals. (33.8) [Hint]
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| 27 . |
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The herbicide 2,4-D functions by acting as a synthetic _____. (33.8) [Hint]
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| 28 . |
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A directional growth response that results in a change in the position of a plant is called __________. (33.9) [Hint]
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| 29 . |
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_______ appear to be responsible for gravitropism. (33.9) [Hint]
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| 30 . |
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Movement in response to touch is _____. (33.9) [Hint]
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| 31 . |
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Circadian rhythms are _____. (33.10) [Hint]
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| 32 . |
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A certain short-day plant flowers when days are less than 12 hours long. Which of the following will cause it to flower? (33.11) [Hint]
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| 33 . |
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A certain plant flowers only if days are shorter than 10 hours. Which of the following will cause it to flower? (33.11) [Hint]
| | 8 hours light, 8 hours dark, flash of red light, 8 hours dark |
| | 12 hours light, 6 hours dark, flash of red light, 6 hours dark |
| | 8 hours light, brief dark period, 8 hours light, 8 hours dark |
| | 8 hours light, 8 hours dark, flash of red light, flash of far-red light, 8 hours dark |
| | 6 hours light, 6 hours dark, 6 hours light, 6 hours dark |
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| 34 . |
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Photoperiodism is ____________. (33.11) [Hint]
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| 35 . |
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A chemical change in a substance called phytochrome _____. (33.12) [Hint]
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| 36 . |
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Some seeds require light for germination, which is controlled by the phytochrome system. In which one of the following treatments would germination NOT occur? (33.12) [Hint]
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| 37 . |
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An Alaskan trapper was worried about being attacked by grizzly bears, so he left on the lights in his cabin all the time. Plants near the cabin flowered a month early. Which of the following best explains this? (33.12) [Hint]
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| 38 . |
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In at least some species of plants, a leaf damaged by a caterpillar __________. (33.14) [Hint]
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| 39 . |
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The production of canavanine is a response of some plants to __________. (33.14) [Hint]
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| 40 . |
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Plant defenses against the herbivores that eat them include _____. (33.14) [Hint]
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