Chapter 28 - Chapter 28 External Factors and Plant Growth...

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Chapter 28: External Factors and Plant Growth Multiple-Choice Questions 1. The Tropisms; p. 622; moderate; ans: e Which of the following statements about tropisms is FALSE? a. They are growth responses. b. They are responses to an external stimulus. c. They are directional responses. d. Responses involve bending or curving. e. Positive responses are away from the stimulus. 2. The Tropisms; p. 623; difficult; ans: e Which of the following is NOT a finding from experiments on the role of auxin in phototropism of coleoptile tips? a. Light does not affect the total amount of auxin. b. Light does not destroy auxin. c. Auxin migrates from the lighted side to the shaded side. d. More auxin can be isolated from the shaded side of an intact tip than from the lighted side. e. If the tip is split and the two halves separated by a barrier, more auxin can be isolated from the shaded side than from the lighted side. 3. The Tropisms; p. 623; moderate; ans: d ______ light is the most effective in producing a phototropic response. a. Green b. Yellow c. Orange d. Blue e. Red 4. The Tropisms; p. 623; easy; ans: c The pigments that absorb the light necessary for the phototropic response are most likely: a. proteins. b. chlorophylls. c. flavins. d. carotenoids. e. anthocyanins.
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5. The Tropisms; p. 623; moderate; ans: a According to the original hypothesis on negative gravitropism of shoots, auxin is redistributed to the ______ side where it ______ cell expansion. a. lower; stimulates b. lower; inhibits c. upper; stimulates d. upper; inhibits e. upper; first inhibits then stimulates 6. The Tropisms; p. 623; moderate; ans: c In plants oriented horizontally, calcium moves toward the ______ surface of shoots and toward the ______ surface of roots before bending occurs. a. upper; upper b. lower; lower c. upper; lower d. lower; upper e. cortical; epidermal 7. The Tropisms; p. 624; moderate; ans: e In roots, statoliths are localized in the: a. epidermal cells. b. vascular tissues. c. cells surrounding the vascular tissues. d. epidermis of the rootcap. e. columella. 8. The Tropisms; p. 624; moderate; ans: a When a growing root is oriented horizontally, the amyloplasts in the central column of the rootcap: a. slide downward. b. float upward. c. attach to the nuclear envelope. d. attach to the mitochondria. e. do not move. 9. The Tropisms; p. 625; difficult; ans: c In contrast to the starch-statolith and the tensegrity hypotheses, the protoplast pressure hypothesis proposes that gravity is sensed by: a. statoliths. b. amyloplasts. c. the pressure of the protoplast on the top and bottom sides of the cell d. tension exerted on the plasma membrane by the cytoskeleton. e. tension exerted on the plasma membrane by the protoplast.
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10. The Tropisms; p. 625; difficult; ans: d According to the tensegrity model, what is the very next event that occurs after sedimenting amyloplasts disrupt actin filaments? a. Auxin is transported into the cell.
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