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