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Bio 122 Ch 39 Quiz
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Multiple Choice Questions
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Which of the following statements about systemic acquired resistance (SAR) in plants is false?
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abscisic acid
0%
Salicylic acid is the only compound involved in SAR signaling.
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Hormones can function at very low concentrations.
0%
Salicylic acid
After leaf abscission, growth will resume from the _____.
0%
FT protein
0%
Salicylic acid
0%
abscisic acid
0%
axillary bud
Which type of mutant would be most likely to produce a bushier phenotype?
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Hormones can function at very low concentrations.
0%
strigolactone underproducer
0%
reduction in the rate of transpiration
0%
Salicylic acid
Auxin is asymmetrically distributed in shoots because the auxin on the side of the plant facing the source of light is destroyed.
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True
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False
Most plants flower when _____.
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Hypersensitive response
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red light during the night.
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steadily all year
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the nights are the right length
Which of these plant hormones is not typically considered a growth-promoting substance?
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Salicylic acid
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apical meristem
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Salicylic acid is the only compound involved in SAR signaling.
0%
abscisic acid
What is the initial localized response of a resistant plant to pathogen invasion?
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Hormones can function at very low concentrations.
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apical meristem
0%
Hypersensitive response
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cell elongation
What is the physical basis of the phototropic response?
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apical meristem
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cell elongation
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Hypersensitive response
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abscisic acid
The Pr form of the phytochrome pigment has maximum absorption in the _____ part of the spectrum
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red
0%
avirulent
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True
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carotenoid
The signaling molecule for flowering might be released earlier than usual in a long-day plant exposed to flashes of
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densely colored cells filled with a waxy layer
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14 hours light/10 hours dark
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red light during the night.
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strigolactone underproducer
Which compound is not used in the localized response to pathogen invasion?
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strigolactone underproducer
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abscisic acid
0%
Salicylic acid
0%
Salicylic acid is the only compound involved in SAR signaling.
Which one of the following is a response in plants to a water deficit?
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Hormones can function at very low concentrations.
0%
Salicylic acid is the only compound involved in SAR signaling.
0%
strigolactone underproducer
0%
reduction in the rate of transpiration
Which of the following statements about hormones is true?
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acid-induced denaturation of cell wall proteins.
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reduction in the rate of transpiration
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Salicylic acid is the only compound involved in SAR signaling.
0%
Hormones can function at very low concentrations.
Evergreen trees lose their leaves _____.
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abscisic acid
0%
steadily all year
0%
apical meristem
0%
cell elongation
The formation of the abscission layer cuts off transport of substances to and from the leaf. As the concentration of sugar trapped within a leaf increases, _____ pigments are produced.
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statoliths
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True
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abscisic acid
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anthrocyanin
How does auxin produce gravitropism in a plant that is placed on its side?
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herbivore
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The hormone systemin is produced at the site of injury and signals the plant to produce proteinase inhibitors
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Auxin accumulates on the lower surface of the root and inhibits elongation of cells in that region.
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Auxin accumulates in cells on the side of the plant opposite the source of light and stimulates their elongation.
How does a plant defend against herbivores?
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The hormone systemin is produced at the site of injury and signals the plant to produce proteinase inhibitors
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Hormones can function at very low concentrations.
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acid-induced denaturation of cell wall proteins.
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by producing heat-shock proteins, which may protect the plant's proteins from denaturing
How does auxin produce phototropism?
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by producing heat-shock proteins, which may protect the plant's proteins from denaturing
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Auxin accumulates in cells on the side of the plant opposite the source of light and stimulates their elongation.
0%
apical meristem
0%
The hormone systemin is produced at the site of injury and signals the plant to produce proteinase inhibitors
_____ trees lose their leaves in preparation for winter.
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cell elongation
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apical meristem
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axillary bud
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deciduous
The hormone that helps plants respond to drought is
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cell elongation
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Salicylic acid
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apical meristem
0%
abscisic acid
Plant hormones act by directly affecting the activities of _____.
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light is perceived by the tips of coleoptiles.
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signal transduction pathway
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apical meristem
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strigolactone underproducer
Charles and Francis Darwin discovered that
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signal transduction pathway
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light is perceived by the tips of coleoptiles.
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the nights are the right length
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Hormones can function at very low concentrations.
The protective layer that forms between the abscission layer and the stem consists of _____.
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reduction in the rate of transpiration
0%
Salicylic acid is the only compound involved in SAR signaling.
0%
red light during the night.
0%
densely colored cells filled with a waxy layer
The breakdown of chlorophyll reveals the _____ pigments of a leaf.
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carotenoid
0%
anthrocyanin
0%
FT protein
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apical meristem
Thigmotropism is a movement in response to _____.
0%
polar
0%
herbivore
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Auxin accumulates on the lower surface of the root and inhibits elongation of cells in that region.
0%
touch
Where does the majority of stem growth in a plant occur?
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Salicylic acid
0%
axillary bud
0%
cell elongation
0%
apical meristem
0 h : 0 m : 1 s
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