Chapter 11 – Growth
25. The suppression of the growth of axillary or lateral buds is called
26. A reduction in the elongation of stems subject to mechanical stresses is called
27. The fruit ripening process releases large quantities of
Chapter 11 – Growth
28. Which of the following is an effect of light on auxin?
29. Which of the following plant movements is due solely to an external stimulus?
30. Special cells that facilitate the perception of gravity by root caps and coleoptiles are
Chapter 11 – Growth
31. Which of the following is a simple device that rotates a potted plant slowly about a
horizontal axis?
Blooms: 1. Remember
32. Plant movements that are not oriented relative to the direction of the stimulus are called
33. Which of the following statements is correct?
Chapter 11 – Growth
34. Which of the following play a major role in water-conservation movements of grasses?
35. The movement of a leaf blade on its petiole to keep the blade oriented perpendicular to the
sun’s rays throughout the day is facilitated by
Chapter 11 – Growth
36. Plants that have two critical photoperiods in order to flower are called
37. The flowering of Arabidopsis is a result of turning on a gene called
_______________________ which produces of a protein that moves from the leaves to the
buds to initiate flowering.
Chapter 11 – Growth
38. This plant pigment has two forms; one form absorbs red light and is then converted into
the second form that absorbs far-red light. The second form, after absorption of far-red light,
is converted back into the red absorbing form. This pigment is
True / False Questions
39. Differentiation refers to changes in the structure of a cell so that it can perform a specific
function.
40. There probably is only one auxin naturally produced by plants.
Chapter 11 – Growth
41. The applications of certain gibberellins to a lawn can cause it to turn green earlier in the
spring.
42. Phototropic responses may vary according to light intensity.
43. Statoliths are involved in phototropisms.
44. Circadian rhythms are found in both plants and animals.
Chapter 11 – Growth
45. Grass leaves may roll up in dry weather when certain cells lose their turgor.
Blooms: 2. Understand
46. Apical dominance can be offset with an application of cytokinins to axillary buds.
47. No developmental process (germination or root and shoot initiation, for example) is
influenced by more than one plant hormone.
48. Day-neutral plants do not need light in order to flower.
Chapter 11 – Growth
49. Dormancy caused by a thick, impervious seed coat may be overcome by filing or nicking
the seed coat.
50. The pigment phytochrome has only one role in plant development; that role is
involvement in plant photoperiodism.
51. Variation in day and night temperatures may influence a species growth rate.
52. A plant that is spindly because it has been grown in the dark is said to be etiolated.
Chapter 11 – Growth
53. Garner and Allard were responsible for coining the term photoperiodism.
54. Quiescence and dormancy with respect to seeds means exactly the same thing: that is, the
embryo of a seed does not grow even if the conditions for growth are favorable.