Question 1

Which of the following watering regimens will be most effective at keeping a lawn green during the hot,dry summer months?

Accepted Answer

A)  daily sprinkling to soak the soil to 0.5 inch
B)  sprinkling every other day to soak the soil to 1.0 inch
C)  sprinkling every third day to soak the soil to 2.0 inches
D)  daily sprinkling to soak the soil to 0.5 inch or sprinkling every other day to soak the soil to 1.0 inch
E)  sprinkling every other day to soak the soil to 1.0 inch or sprinkling every third day to soak the soil to 2.0 inchesF) B) and E)
G) B) and C)

Question 2

Which of the following statements applies to plant growth regulators?

Accepted Answer

A)  They only act by altering gene expression.
B)  They often have a multiplicity of effects.
C)  They function independently of other hormones.
D)  They directly control plant protein synthesis and assembly.
E)  They affect the division and elongation, but not the differentiation, of cells.F) None of the above
G) A) and C)

Question 3

-The results of this experiment,shown on the left of the graph (area A) ,may be used to

Accepted Answer

A)  show that these plants can live without gibberellin.
B)  show that gibberellin is necessary in positive gravitropism.
C)  show that taller plants with more gibberellin produce fruit (pods) .
D)  show a correlation between plant height and gibberellin concentration.
E)  study phytoalexins in plants.F) B) and D)
G) D) and E)

Question 4

Which of the following statements is correct with regards to a "circadian rhythm" in plants?

Accepted Answer

A)  It may have the same signal transduction pathway in all organisms.
B)  Once set, it cannot be changed.
C)  It works independently of photoperiodic responses.
D)  Once set, it is independent of external signals.
E)  It can be changed to a longer or shorter period by altering the light quality.F) D) and E)
G) C) and E)

Question 5

The transduction pathway that activates systemic acquired resistance in plants is initially signalled by

Accepted Answer

A)  antisense RNA.
B)  Pfr phytochrome.
C)  salicylic acid.
D)  abscisic acid.
E)  red, but not far-red, light.F) A) and E)
G) B) and C)

Question 6

If you wanted to genetically engineer a plant to be more resistant to drought,increasing amounts of which of the following hormones might be a good first attempt?

Accepted Answer

A)  abscisic acid
B)  brassinosteroids
C)  gibberellins
D)  cytokinins
E)  auxinF) C) and D)
G) None of the above

Question 7

Similar to other hormones,gibberellins affect plant development in several ways,except to

Accepted Answer

A)  stimulate pollen tube growth.
B)  cause bolting.
C)  promote normal fruit growth.
D)  induce seed dormancy.
E)  stimulate stem and leaf growth.F) D) and E)
G) A) and C)

Question 8

Plant hormones can have different effects at different concentrations.This explains how

Accepted Answer

A)  some plants are long-day plants and others are short-day plants.
B)  signal transduction pathways in plants are different from those in animals.
C)  plant genes recognize pathogen genes.
D)  auxin can stimulate cell elongation in apical meristems, yet will inhibit the growth of axillary buds.
E)  gibberellin concentration can both induce and break dormancy.F) C) and D)
G) B) and E)

Question 9

Why do coleoptiles grow toward light?

Accepted Answer

A)  Auxin is destroyed by light.
B)  Gibberellins are destroyed by light.
C)  Auxin synthesis is stimulated in the dark.
D)  Auxin moves away from the light to the shady side.
E)  Gibberellins move away from the light to the shady side.F) B) and D)
G) A) and B)

Question 10

A particular species of virus carries a gene for salicylate hydroxylase,an enzyme that breaks down salicylic acid.Will this virus be more or less virulent to plants than other viruses?

Accepted Answer

A)  more
B)  less
C)  This will not make the virus more or less virulent.D) A) and C)
E) All of the above

Question 11

Which of the following plant hormones would be found in very low amounts in a mature,water-stressed tomato plant?

Accepted Answer

A)  auxins, abscisic acid, brassinosteroids
B)  auxins, gibberellins, cytokinins
C)  gibberellins, cytokinins, ethylene
D)  phytochrome, cytokinins, abscisic acid
E)  brassinosteroids, ethylene, phytochromeF) B) and E)
G) B) and C)

Question 12

The following questions refer to the description below.
Plants are not able to move away from predators,so they have evolved chemical methods to protect themselves.Biologists have observed that caterpillars munching on a leaf can be attacked by certain species of wasps.These wasps lay their eggs inside the caterpillar's body,and when the eggs hatch,the larvae feed on its host from the inside.
-Wasps that are free-living but lay their eggs in another species,such as described above,are called

Accepted Answer

A)  parasites.
B)  predators.
C)  parasitoids.
D)  competitors.
E)  insect pests.F) C) and E)
G) All of the above

Question 13

The signalling molecule for flowering might be released earlier than usual in a long-day plant exposed to flashes of

Accepted Answer

A)  far-red light during the night.
B)  red light during the night.
C)  red light followed by far-red light during the night.
D)  far-red light during the day.
E)  red light during the day.F) B) and E)
G) A) and E)

Question 14

Most plants close their stomata at night.What colour of light would be most effective in promoting stomatal opening in the middle of the night?

Accepted Answer

A)  red
B)  far-red
C)  blue
D)  red followed by far-red
E)  far-red followed by blueF) C) and D)
G) D) and E)

Question 15

Gravitropism in plant shoots and roots differ in that

Accepted Answer

A)  only shoots depend upon auxin distribution.
B)  only shoots depend upon the aggregation of statoliths.
C)  only roots exhibit rapid elongation of specific cells.
D)  only roots sense gravity at the tips.
E)  the threshold and response time is much less in shoots than in roots.F) A) and B)
G) A) and C)

Question 16

Incandescent light bulbs,which have high output of red light,are least effective in promoting

Accepted Answer

A)  photosynthesis.
B)  seed germination.
C)  phototropism.
D)  flowering.
E)  entrainment of circadian rhythms.F) D) and E)
G) A) and B)

Question 17

Which of the following plant growth responses is primarily due to the action of auxins?

Accepted Answer

A)  leaf abscission
B)  fruit development
C)  cell division
D)  the detection of photoperiod
E)  cell elongationF) A) and B)
G) None of the above

Question 18

Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun.To reach a large tree,the most useful kind of growth movement for a tropical vine presumably would be the opposite of

Accepted Answer

A)  positive thigmotropism.
B)  positive phototropism.
C)  positive gravitropism.
D)  sleep movements.
E)  circadian rhythms.F) A) and B)
G) D) and E)

Question 19

The apical bud of a shoot produces ________,resulting in the inhibition of lateral bud growth.

Accepted Answer

A)  abscisic acid
B)  ethylene
C)  cytokinin
D)  gibberellin
E)  auxinF) A) and C)
G) B) and C)

Question 20

-The heavy line in the above figure illustrates the relationship between auxin concentration and cell growth in stem tissues.If the same range of concentrations were applied to lateral buds,what curve(s) would probably be produced?

Accepted Answer

A)  I
B)  II
C)  III
D)  II or III
E)  I or IIIF) B) and D)
G) B) and C)

Exam 39: Plant Responses to Internal and External Signals

Incandescent light bulbs,which have high output of red light,are least effective in promoting

Correct Answer
verified

The transduction pathway that activates systemic acquired resistance in plants is initially signalled by

Correct Answer
verified

Which of the following statements is correct with regards to a "circadian rhythm" in plants?

Correct Answer
verified

Why do coleoptiles grow toward light?

Correct Answer
verified

If you wanted to genetically engineer a plant to be more resistant to drought,increasing amounts of which of the following hormones might be a good first attempt?

Correct Answer
verified

Most plants close their stomata at night.What colour of light would be most effective in promoting stomatal opening in the middle of the night?

Correct Answer
verified

Similar to other hormones,gibberellins affect plant development in several ways,except to

Correct Answer
verified

Which of the following plant hormones would be found in very low amounts in a mature,water-stressed tomato plant?

Correct Answer
verified

Gravitropism in plant shoots and roots differ in that

Correct Answer
verified

-The results of this experiment,shown on the left of the graph (area A) ,may be used to

Correct Answer
verified

Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun.To reach a large tree,the most useful kind of growth movement for a tropical vine presumably would be the opposite of

Correct Answer
verified

Which of the following watering regimens will be most effective at keeping a lawn green during the hot,dry summer months?

Correct Answer
verified

Correct Answer
verified

Plant hormones can have different effects at different concentrations.This explains how

Correct Answer
verified

A particular species of virus carries a gene for salicylate hydroxylase,an enzyme that breaks down salicylic acid.Will this virus be more or less virulent to plants than other viruses?

Correct Answer
verified

Which of the following plant growth responses is primarily due to the action of auxins?

Correct Answer
verified

Which of the following statements applies to plant growth regulators?

Correct Answer
verified

The apical bud of a shoot produces ________,resulting in the inhibition of lateral bud growth.

Correct Answer
verified

The signalling molecule for flowering might be released earlier than usual in a long-day plant exposed to flashes of

Correct Answer
verified

-The heavy line in the above figure illustrates the relationship between auxin concentration and cell growth in stem tissues.If the same range of concentrations were applied to lateral buds,what curve(s) would probably be produced?

Correct Answer
verified

Exam 39: Plant Responses to Internal and External Signals

Incandescent light bulbs,which have high output of red light,are least effective in promoting

Correct AnswerverifiedShow Answer

The transduction pathway that activates systemic acquired resistance in plants is initially signalled by

Correct AnswerverifiedShow Answer

Which of the following statements is correct with regards to a "circadian rhythm" in plants?

Correct AnswerverifiedShow Answer

Why do coleoptiles grow toward light?

Correct AnswerverifiedShow Answer

If you wanted to genetically engineer a plant to be more resistant to drought,increasing amounts of which of the following hormones might be a good first attempt?

Correct AnswerverifiedShow Answer

Most plants close their stomata at night.What colour of light would be most effective in promoting stomatal opening in the middle of the night?

Correct AnswerverifiedShow Answer

Similar to other hormones,gibberellins affect plant development in several ways,except to

Correct AnswerverifiedShow Answer

Which of the following plant hormones would be found in very low amounts in a mature,water-stressed tomato plant?

Correct AnswerverifiedShow Answer

Gravitropism in plant shoots and roots differ in that

Correct AnswerverifiedShow Answer

-The results of this experiment,shown on the left of the graph (area A) ,may be used to

Correct AnswerverifiedShow Answer

Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun.To reach a large tree,the most useful kind of growth movement for a tropical vine presumably would be the opposite of

Correct AnswerverifiedShow Answer

Which of the following watering regimens will be most effective at keeping a lawn green during the hot,dry summer months?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Plant hormones can have different effects at different concentrations.This explains how

Correct AnswerverifiedShow Answer

A particular species of virus carries a gene for salicylate hydroxylase,an enzyme that breaks down salicylic acid.Will this virus be more or less virulent to plants than other viruses?

Correct AnswerverifiedShow Answer

Which of the following plant growth responses is primarily due to the action of auxins?

Correct AnswerverifiedShow Answer

Which of the following statements applies to plant growth regulators?

Correct AnswerverifiedShow Answer

The apical bud of a shoot produces ________,resulting in the inhibition of lateral bud growth.

Correct AnswerverifiedShow Answer

The signalling molecule for flowering might be released earlier than usual in a long-day plant exposed to flashes of

Correct AnswerverifiedShow Answer

-The heavy line in the above figure illustrates the relationship between auxin concentration and cell growth in stem tissues.If the same range of concentrations were applied to lateral buds,what curve(s) would probably be produced?

Correct AnswerverifiedShow Answer

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