Which of the following statements about systemic acquired resistance (SAR) in plants is false?
0%
abscisic acid
0%
Salicylic acid is the only compound involved in SAR signaling.
100%
Hormones can function at very low concentrations.
0%
Salicylic acid
Q.2.
After leaf abscission, growth will resume from the _____.
0%
FT protein
0%
Salicylic acid
0%
abscisic acid
0%
axillary bud
Q.3.
Which type of mutant would be most likely to produce a bushier phenotype?
0%
Hormones can function at very low concentrations.
0%
strigolactone underproducer
0%
reduction in the rate of transpiration
0%
Salicylic acid
Q.4.
Auxin is asymmetrically distributed in shoots because the auxin on the side of the plant facing the source of light is destroyed.
0%
True
0%
False
Q.5.
Most plants flower when _____.
0%
Hypersensitive response
0%
red light during the night.
0%
steadily all year
0%
the nights are the right length
Q.6.
Which of these plant hormones is not typically considered a growth-promoting substance?
0%
Salicylic acid
0%
apical meristem
0%
Salicylic acid is the only compound involved in SAR signaling.
0%
abscisic acid
Q.7.
What is the initial localized response of a resistant plant to pathogen invasion?
0%
Hormones can function at very low concentrations.
0%
apical meristem
0%
Hypersensitive response
0%
cell elongation
Q.8.
What is the physical basis of the phototropic response?
0%
apical meristem
0%
cell elongation
0%
Hypersensitive response
0%
abscisic acid
Q.9.
The Pr form of the phytochrome pigment has maximum absorption in the _____ part of the spectrum
0%
red
0%
avirulent
0%
True
0%
carotenoid
Q.10.
The signaling molecule for flowering might be released earlier than usual in a long-day plant exposed to flashes of
0%
densely colored cells filled with a waxy layer
0%
14 hours light/10 hours dark
0%
red light during the night.
0%
strigolactone underproducer
Q.11.
Which compound is not used in the localized response to pathogen invasion?
0%
strigolactone underproducer
0%
abscisic acid
0%
Salicylic acid
0%
Salicylic acid is the only compound involved in SAR signaling.
Q.12.
Which one of the following is a response in plants to a water deficit?
0%
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
Q.13.
Which of the following statements about hormones is true?
0%
acid-induced denaturation of cell wall proteins.
0%
reduction in the rate of transpiration
0%
Salicylic acid is the only compound involved in SAR signaling.
0%
Hormones can function at very low concentrations.
Q.14.
Evergreen trees lose their leaves _____.
0%
abscisic acid
0%
steadily all year
0%
apical meristem
0%
cell elongation
Q.15.
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.
0%
statoliths
0%
True
0%
abscisic acid
0%
anthrocyanin
Q.16.
How does auxin produce gravitropism in a plant that is placed on its side?
0%
herbivore
0%
The hormone systemin is produced at the site of injury and signals the plant to produce proteinase inhibitors
0%
Auxin accumulates on the lower surface of the root and inhibits elongation of cells in that region.
0%
Auxin accumulates in cells on the side of the plant opposite the source of light and stimulates their elongation.
Q.17.
How does a plant defend against herbivores?
0%
The hormone systemin is produced at the site of injury and signals the plant to produce proteinase inhibitors
0%
Hormones can function at very low concentrations.
0%
acid-induced denaturation of cell wall proteins.
0%
by producing heat-shock proteins, which may protect the plant's proteins from denaturing
Q.18.
How does auxin produce phototropism?
0%
by producing heat-shock proteins, which may protect the plant's proteins from denaturing
0%
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
Q.19.
_____ trees lose their leaves in preparation for winter.
0%
cell elongation
0%
apical meristem
0%
axillary bud
0%
deciduous
Q.20.
The hormone that helps plants respond to drought is
0%
cell elongation
0%
Salicylic acid
0%
apical meristem
0%
abscisic acid
Q.21.
Plant hormones act by directly affecting the activities of _____.
0%
light is perceived by the tips of coleoptiles.
0%
signal transduction pathway
0%
apical meristem
0%
strigolactone underproducer
Q.22.
Charles and Francis Darwin discovered that
0%
signal transduction pathway
0%
light is perceived by the tips of coleoptiles.
0%
the nights are the right length
0%
Hormones can function at very low concentrations.
Q.23.
The protective layer that forms between the abscission layer and the stem consists of _____.
0%
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
Q.24.
The breakdown of chlorophyll reveals the _____ pigments of a leaf.
0%
carotenoid
0%
anthrocyanin
0%
FT protein
0%
apical meristem
Q.25.
Thigmotropism is a movement in response to _____.
0%
polar
0%
herbivore
0%
Auxin accumulates on the lower surface of the root and inhibits elongation of cells in that region.
0%
touch
Q.26.
Where does the majority of stem growth in a plant occur?
0%
Salicylic acid
0%
axillary bud
0%
cell elongation
0%
apical meristem
Support mcqgeeks.com by disabling your adblocker.
Please disable the adBlock and continue. Thank you.