Biology, Eighth Edition (Raven)

Chapter 41: Sensory Systems in Plants

Pre Test

1
How does phytochrome indicate the presence of red light? (p. 802)
A)It undergoes a conformational change which allows it to be ubiquitinated and subsequently destroyed by a proteasome.
B)It binds to promoters of specific genes to turn them on
C)It binds to promoters of specific genes, preventing RNA polymerase from binding and therefore blocks expression.
D)It binds to chlorophyll to improve its ability to absorb light.
E)It blocks the Calvin cycle, allowing the plant's metabolism to concentrate on signal transduction.
2
What organelle participates most directly in gravity perception? (p. 806)
A)Amyloplasts
B)Auxins
C)Gravoliths
D)The endoplasmic reticulum
E)The nucleus
3
What is the definition of thigmotropism? (p. 808)
A)Specific responses caused by hormone accumulation in plant tissues
B)Irreversible changes in tissue structure because of physical stimulation
C)Patterns of growth caused by repeated, regular contact with a stimulus
D)Coiling of plant tissues around nearby, cylindrical objects
E)Directional growth of plant parts due to contact with something
4
True or false: The abscission zone of a leaf is defined by the axillary bud, which is sloughed off during cold temperatures. (p. 811)
A)True
B)False
5
Which plant hormone is volatile, consisting of only two carbons? (p. 814)
A)Auxin
B)Cytokinin
C)Ethylene
D)Giberellin
E)Brassinosteroid
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