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| 1 | |
An organic molecule produced by a plant that has physiological and/or developmental effects on the plant is called a(n) |
| | A) | mineral. |
| | B) | nutrient. |
| | C) | enzyme. |
| | D) | plant hormone. |
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| 2 | |
Which of the following is the mechanism by which a hormone brings about a plant response to a stimulus? |
| | A) | a signal transduction pathway |
| | B) | a hormone transport chain |
| | C) | cellular respiration |
| | D) | a feedback loop |
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| 3 | |
True or False: Plant response to stimulus, which occurs on a cellular level, produces observable changes in the plant. |
| | A) | True |
| | B) | False |
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| 4 | |
Which of the following describes a method used when pruning a plant that takes advantage of a natural phenomenon to achieve a fuller looking plant? |
| | A) | pruning the sides of a plant to disrupt axillary dominance caused by auxins |
| | B) | pruning the top of a plant to disrupt apical dominance caused by auxins |
| | C) | pruning the bottom of the plant to encourage auxins to move up into the middle |
| | D) | pruning the top of a plant to encourage apical dominance caused by auxins |
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| 5 | |
True or False: Auxin moves to the sunny side of a stem exposed to unidirectional light. |
| | A) | True |
| | B) | False |
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| 6 | |
If I want to encourage seeds I am planting in a pot to germinate, I might add which plant hormone to the soil in the pot? |
| | A) | auxins |
| | B) | cytokinins |
| | C) | phytochrome |
| | D) | gibberellins |
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| 7 | |
When a plant organ ages, large molecules within the organ are broken down and transported to other parts of the plant in the process of __________. This can be prevented by __________. |
| | A) | senescence; cytokinins |
| | B) | dormancy; ethylene |
| | C) | abscission; abscisic acid |
| | D) | ripening; ethylene |
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| 8 | |
Where are cytokinins produced? |
| | A) | in flowers |
| | B) | in leaves |
| | C) | in vascular tissue |
| | D) | in root apical meristem |
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| 9 | |
The combination of which two plant hormones promotes plant tissues to differentiate? |
| | A) | auxins and gibberellins |
| | B) | auxins and cytokinins |
| | C) | ethylene and abscisic acid |
| | D) | cytokinins and gibberellins |
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| 10 | |
Abscisic acid is sometimes called the stress hormone because it |
| | A) | helps the plant recover from a wound. |
| | B) | encourages the plant to produce chemical toxins when injured. |
| | C) | causes seeds and buds to remain dormant under certain conditions and causes stomata to close. |
| | D) | is present when a plant is exposed to adequate moisture and sunlight. |
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| 11 | |
Once abscission has begun, ethylene stimulates enzymes like cellulase, which cause |
| | A) | fruit drop. |
| | B) | leaf drop. |
| | C) | flower drop. |
| | D) | ethylene’s stimulation of enzymes like cellulase causes all of these things to drop. |
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| 12 | |
Upward growth, against gravity, is termed __________ gravitropism, while downward growth, with gravity, is termed __________ gravitropism. Both of these growth patterns result from alternative responses to __________ in different tissue types. |
| | A) | negative; positive; auxin |
| | B) | positive; negative; gibberellins |
| | C) | negative’ positive; cytokinins |
| | D) | positive; negative; ethylene |
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| 13 | |
Coiling of the stem of a plant occurs because |
| | A) | of the angle of light the plant receives. |
| | B) | of a plant’s response to blue light. |
| | C) | plant cells that are deprived of oxygen shrivel up while those exposed to oxygen do not. |
| | D) | plant cells that come in contact with a solid object grow less while those not in contact with the object continue to elongate. |
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| 14 | |
With regards to leaves, turgid cells have __________ internal potassium ions when compared to limp cells. |
| | A) | almost no |
| | B) | more |
| | C) | less |
| | D) | an equal proportion of |
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| 15 | |
Activities that occur regularly in a 24-hour cycle are termed |
| | A) | biological clocks. |
| | B) | sleep movements. |
| | C) | circadian rhythms. |
| | D) | turgor movements. |
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| 16 | |
Phytochrome is a plant photoreceptor that is converted to its inactive form by __________ light. The inactive form of phytochrome is activated by __________ light. |
| | A) | red; blue |
| | B) | blue; far-red |
| | C) | red; far-red |
| | D) | far-red; red |
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| 17 | |
Active phytochrome __________, where it __________. |
| | A) | moves into the nucleus; activates or inactivates specific genes |
| | B) | moves out of the nucleus, into the cytoplasm; is broken down into two separate proteins |
| | C) | moves into the nucleus; is combined with other phytochrome complexes to form super-complexes of four or more proteins |
| | D) | moves into the chloroplasts of plant cells; aids in photosynthesis |
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| 18 | |
A __________ plant will flower if the night is longer than critical length. A __________ plant will flower if night is shorter than a critical length. |
| | A) | long day; day-neutral |
| | B) | day-neutral; short-day |
| | C) | long-day; short-day |
| | D) | short-day; long-day |
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| 19 | |
Which physical barrier projects from the epidermis and may contain poisons to serve as a defense mechanism? |
| | A) | a root hair |
| | B) | a trichome |
| | C) | a pulvinus |
| | D) | a statolith |
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| 20 | |
True or False: Plants only produce chemical defenses in response to a stimulus, like physical injury caused by attempts to be eaten. |
| | A) | True |
| | B) | False |
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