Question 1

Cold hardiness refers to the process of preparing the plant for winter.

Accepted Answer

A) True 
 B)False

Question 2

In terms of the circadian clock, gating refers to the observation that stimuli of _____ strength employed at different times of the day can result in ______ intensity of response.

Accepted Answer

A)   different; a smaller
B)   different; the same
C)   different; different
D)   equal; the same
E)   equal; a different

Question 3

Photoperiodism pertains to events that are influenced by the relative lengths of light and dark.

Accepted Answer

A) True 
 B)False

Question 4

If lettuce seeds are exposed first to red light followed immediately by exposure to far-red light the seeds will germinate.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following statements concerning photoperiodism is FALSE?

Accepted Answer

A)   Short-day plants in the early spring or fall.
B)   Spinach and lettuce are examples of long-day plants.
C)   Day-neutral plants flower without respect to photoperiod.
D)   Photoperiodic behavior remains constant over a wide range of temperatures.
E)   In some plants, only a single exposure to the critical day-length will produce a response.

Question 6

Which of the following statements about thigmotropism is FALSE?

Accepted Answer

A)   It enables roots to navigate around rocks.
B)   It is a response to contact with a solid object.
C)   An example is the climbing of tendrils.
D)   Cells touching the support lengthen more than cells on the other side.
E)   The stems of peas can store the memory of tactile stimulation.

Question 7

Light with a wavelength of about ______ nanometers is the most effective for interrupting the dark period of both short-day and long-day plants.

Accepted Answer

A)   220
B)   340
C)   440
D)   660
E)   730 D

Question 8

In Arabidopsis thaliana, touch induces the expression of genes that encode proteins related to ______, suggesting a role for ______ in thigmomorphogenesis.

Accepted Answer

A)   an endogenous inhibitor; the biological clock
B)   amylase; starch
C)   the cytoskeleton; microtubules
D)   calmodulin; calcium
E)   chlorophyll; magnesium

Question 9

An etiolated eudicot seedling:

Accepted Answer

A)   has a short stem.
B)   has small leaves.
C)   is green.
D)   lacks plastids.
E)   cannot undergo further growth.

Question 10

In contrast to thigmonastic movements, thigmomorphogenesis:

Accepted Answer

A)   is a response to touch.
B)   is a response to a mechanical stimulus.
C)   is independent of the direction of the stimulus.
D)   involves cells of the pulvinus.
E)   involves an altered growth pattern.

Question 11

In Arabidopsis, the floral stimulus is produced in companion cells of leaves.

Accepted Answer

A) True 
 B)False  True

Question 12

If a short-day plant receives a one-minute exposure to light in the middle of the dark period rather than continuous darkness, it will:

Accepted Answer

A)   produce more flowers.
B)   produce smaller flowers.
C)   produce larger flowers.
D)   flower at a lower temperature.
E)   not flower.

Question 13

In Arabidopsis, the FT gene encodes the FT protein, which is the florigen.

Accepted Answer

A) True 
 B)False  True

Question 14

In the current model of root gravitropism, elongation is _____ in the upper side of the distal elongation zone and ______ along the lower side.

Accepted Answer

A)   stimulated; stimulated
B)   stimulated; suppressed
C)   suppressed; stimulated
D)   suppressed; is neither stimulated nor suppressed
E)   is neither stimulated nor suppressed; suppressed

Question 15

The sleep movements of plants are an example of nastic movements.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following statements concerning hydrotropism is FALSE?

Accepted Answer

A)   It is the directed growth of roots in response to moisture.
B)   Decapped roots do not curve hydrotropically.
C)   Under normal gravity, hydrotropism is suppressed by gravitropism.
D)   Auxin apparently is required for hydrotropism.
E)   Inhibitors of auxin influx and efflux also inhibit hydrotropism.

Question 17

When a growing root is oriented horizontally, the amyloplasts in the central column of the rootcap:

Accepted Answer

A)   slide downward.
B)   float upward.
C)   attach to the nuclear envelope.
D)   attach to the mitochondria.
E)   do not move.

Question 18

Suppose lettuce seeds are exposed to a series of alternating flashes of red light (abbreviated R)  and far-red light (abbreviated FR) . (E.g., a flash of red light followed by a flash of far-red light is denoted as R→RF.)  Which of the following series of flashes would result in the germination of those seeds?

Accepted Answer

A)   FR only
B)   R→FR
C)   R→FR →R→FR
D)   R →FR→R→FR→R
E)   R→FR→R→FR→R→FR

Question 19

Vernalization is the exposure of flower buds to low temperatures to promote early flowering.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following statements about circadian clocks is FALSE?

Accepted Answer

A)   Input pathways and output pathways are the parts of the clock that do not interact.
B)   Conceptually they consist of three parts.
C)   They cause the regular oscillation of 30-40 percent of Arabidopsis genes.
D)   The central oscillator is the part of the clock that generates rhythmic behavior.
E)   Input pathways are the part of the clock that carries information to the oscillator.

Exam 28: External Factors and Plant Growth

Cold hardiness refers to the process of preparing the plant for winter.

Correct Answer
verified

In terms of the circadian clock, gating refers to the observation that stimuli of _ strength employed at different times of the day can result in __ intensity of response.

Correct Answer
verified

Photoperiodism pertains to events that are influenced by the relative lengths of light and dark.

Correct Answer
verified

If lettuce seeds are exposed first to red light followed immediately by exposure to far-red light the seeds will germinate.

Correct Answer
verified

Which of the following statements concerning photoperiodism is FALSE?

Correct Answer
verified

Which of the following statements about thigmotropism is FALSE?

Correct Answer
verified

Light with a wavelength of about ______ nanometers is the most effective for interrupting the dark period of both short-day and long-day plants.

Correct Answer
verified
D

In Arabidopsis thaliana, touch induces the expression of genes that encode proteins related to , suggesting a role for in thigmomorphogenesis.

Correct Answer
verified

An etiolated eudicot seedling:

Correct Answer
verified

In contrast to thigmonastic movements, thigmomorphogenesis:

Correct Answer
verified

In Arabidopsis, the floral stimulus is produced in companion cells of leaves.

Correct Answer
verified
True

If a short-day plant receives a one-minute exposure to light in the middle of the dark period rather than continuous darkness, it will:

Correct Answer
verified

In Arabidopsis, the FT gene encodes the FT protein, which is the florigen.

Correct Answer
verified
True

In the current model of root gravitropism, elongation is _ in the upper side of the distal elongation zone and __ along the lower side.

Correct Answer
verified

The sleep movements of plants are an example of nastic movements.

Correct Answer
verified

Which of the following statements concerning hydrotropism is FALSE?

Correct Answer
verified

When a growing root is oriented horizontally, the amyloplasts in the central column of the rootcap:

Correct Answer
verified

Correct Answer
verified

Vernalization is the exposure of flower buds to low temperatures to promote early flowering.

Correct Answer
verified

Which of the following statements about circadian clocks is FALSE?

Correct Answer
verified

Exam 28: External Factors and Plant Growth

Cold hardiness refers to the process of preparing the plant for winter.

Correct AnswerverifiedShow Answer

In terms of the circadian clock, gating refers to the observation that stimuli of _____ strength employed at different times of the day can result in ______ intensity of response.

Correct AnswerverifiedShow Answer

Photoperiodism pertains to events that are influenced by the relative lengths of light and dark.

Correct AnswerverifiedShow Answer

If lettuce seeds are exposed first to red light followed immediately by exposure to far-red light the seeds will germinate.

Correct AnswerverifiedShow Answer

Which of the following statements concerning photoperiodism is FALSE?

Correct AnswerverifiedShow Answer

Which of the following statements about thigmotropism is FALSE?

Correct AnswerverifiedShow Answer

Light with a wavelength of about ______ nanometers is the most effective for interrupting the dark period of both short-day and long-day plants.

Correct AnswerverifiedD

In Arabidopsis thaliana, touch induces the expression of genes that encode proteins related to ______, suggesting a role for ______ in thigmomorphogenesis.

Correct AnswerverifiedShow Answer

An etiolated eudicot seedling:

Correct AnswerverifiedShow Answer

In contrast to thigmonastic movements, thigmomorphogenesis:

Correct AnswerverifiedShow Answer

In Arabidopsis, the floral stimulus is produced in companion cells of leaves.

Correct AnswerverifiedTrue

If a short-day plant receives a one-minute exposure to light in the middle of the dark period rather than continuous darkness, it will:

Correct AnswerverifiedShow Answer

In Arabidopsis, the FT gene encodes the FT protein, which is the florigen.

Correct AnswerverifiedTrue

In the current model of root gravitropism, elongation is _____ in the upper side of the distal elongation zone and ______ along the lower side.

Correct AnswerverifiedShow Answer

The sleep movements of plants are an example of nastic movements.

Correct AnswerverifiedShow Answer

Which of the following statements concerning hydrotropism is FALSE?

Correct AnswerverifiedShow Answer

When a growing root is oriented horizontally, the amyloplasts in the central column of the rootcap:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Vernalization is the exposure of flower buds to low temperatures to promote early flowering.

Correct AnswerverifiedShow Answer

Which of the following statements about circadian clocks is FALSE?

Correct AnswerverifiedShow Answer

Correct Answer
verified

In terms of the circadian clock, gating refers to the observation that stimuli of _ strength employed at different times of the day can result in __ intensity of response.

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
D

In Arabidopsis thaliana, touch induces the expression of genes that encode proteins related to , suggesting a role for in thigmomorphogenesis.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
True

Correct Answer
verified

Correct Answer
verified
True

In the current model of root gravitropism, elongation is _ in the upper side of the distal elongation zone and __ along the lower side.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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