Question 1

A hormone that causes cell division and is found in coconut milk and in dividing root tissue is

Accepted Answer

A)   abscisic acid.
B)   auxin.
C)   cytokinin.
D)   ethylene.
E)   gibberellin.F) A) and B)
G) All of the above C

Question 2

Explain how the stems and roots of a plant will respond at the cellular level if it is placed upon its' side.

Accepted Answer

The plant will experience gravitrophism....

Question 3

Which of the following hormones are believed to be involved in abscission?

Accepted Answer

A)   ethylene
B)   auxin
C)   gibberellin
D)   All of the answer choices are correct.E) B) and C)
F) A) and C) D

Question 4

In order for hormones like auxin to be used as a chemical signal within a plant it must travel through the xylem to reach the site of activity.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following plant hormones is associated with the closure of stomata in a plant under water stress?

Accepted Answer

A)   abscisic acid
B)   auxin
C)   cytokinin
D)   ethylene
E)   gibberellinF) A) and B)
G) All of the above

Question 6

How does gibberellin actually work?

Accepted Answer

A)   In the presence of blue light, it triggers additional photosynthesis and growth.
B)   It attaches to a plasma membrane receptor and results in gene activation to produce the enzyme amylase that releases sugars for additional cell growth, division, and elongation.
C)   In the presence of light, it increases the formation of additional DNA that codes for additional plant structures.
D)   In the presence of unidirectional light, it moves to the shady side and activates an ATP-driven proton pump that results in weakened cell walls and eventual elongation.
E)   In the presence of light, it increases the turgor pressure of the cell and accelerates growth.F) A) and E)
G) A) and D)

Question 7

Went's experiment in 1926 with oat coleoptiles showed that agar that absorbed auxin from the tips would cause a tipless shoot to curve away from the side where he had placed the agar, suggesting that auxin causes cells to elongate.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following plant hormones was studied in the 1880s by Charles and Francis Darwin in experiments on phototropism?

Accepted Answer

A)   abscisic acid
B)   auxin
C)   cytokinin
D)   ethylene
E)   gibberellinF) A) and D)
G) A) and E)

Question 9

Long-day plants flower when the day length is longer than the critical period.

Accepted Answer

A) True 
 B)False  True

Question 10

Explain how abscisic acid promotes the closure of stomates. Identify the molecules involved at each step.
  
A. __________
B. __________
C. __________
D. __________

Accepted Answer

A. Abscisic acid binding to its receptor...

Question 11

Explain the mechanisms required for a Venus flytrap to close its' trap when stimulated by an insect.

Accepted Answer

Turgor pressure is required to cause the...

Question 12

How does auxin actually cause stems to curve towards the light?

Accepted Answer

A)   In the presence of blue light, auxin triggers additional photosynthesis and growth.
B)   In the presence of light, auxin increases the turgor pressure of the cell and accelerates growth.
C)   In the presence of light, auxin increases the formation of hydrolytic enzymes that release energy needed for growth purposes.
D)   In the presence of light, auxin moves toward the light source and activates a protein that binds to DNA and starts enzyme production.
E)   In the presence of unidirectional light, auxin moves to the shady side and activates an ATP-driven proton pump that results in weakened cell walls and eventual elongation.F) C) and D)
G) A) and B)

Question 13

Which of the following is NOT a physiological change related to photoperiodism?

Accepted Answer

A)   seed germination
B)   root branching
C)   breaking bud dormancy
D)   some flowering
E)   onset of senescenceF) None of the above
G) C) and D)

Question 14

Which of the following plant hormones is associated with the closure of stomata when a plant experiences water stress?

Accepted Answer

A)   abscisic acid
B)   auxin
C)   cytokinin
D)   gibberellinsE) C) and D)
F) A) and D)

Question 15

The conclusion drawn from these results is that the length of the dark period, not the light period, controls flowering.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following plant hormones stimulates the ripening of fruit and inhibits plant growth?

Accepted Answer

A)   abscisic acid
B)   auxin
C)   cytokinin
D)   ethylene
E)   gibberellinF) A) and B)
G) C) and D)

Question 17

Which of the following plant hormones was discovered in infected rice seedlings that grew extremely tall and slender with "foolish seedling disease"?

Accepted Answer

A)   abscisic acid
B)   auxin
C)   cytokinin
D)   ethylene
E)   gibberellinsF) A) and E)
G) None of the above

Question 18

Plants could readily develop seasonal responses for flowering based on temperature changes but have "elected" through evolution to manage their rhythms based on a comparison of daylight and darkness. Why has the day-night ratio system been selected?

Accepted Answer

A)   Temperature has no effect upon plant biochemistry.
B)   Temperature is a gradation but day/night is all-or-nothing.
C)   A plant's nervous system is tuned to light stimuli and not to temperature stimuli.
D)   Temperatures fluctuate widely across seasons and from year to year, but photoperiod comparisons are a more reliable indicator of season.E) A) and B)
F) All of the above

Question 19

Which of the following statements is NOT correct about a circadian rhythm?

Accepted Answer

A)   These rhythms tend to persist even in the absence of daily light cues.
B)   An example is the opening of stomates in the morning and their closing at night.
C)   If plants are maintained in total darkness or total light, their circadian rhythm acts on a faster time scale.
D)   The primary usefulness of circadian rhythms seems to be to measure day-length changes so plants respond appropriately to seasonal environmental changes.E) All of the above
F) A) and D)

Question 20

The germinating corn seed pictured below is displaying

Accepted Answer

A)   negative gravitropism.
B)   positive gravitropism.
C)   thigmotropism.
D)   negative phototropism.
E)   positive phototropism.F) B) and E)
G) B) and C)

Exam 26: Flowering Plants: Control of Growth Responses

A hormone that causes cell division and is found in coconut milk and in dividing root tissue is

Correct AnswerverifiedC

Explain how the stems and roots of a plant will respond at the cellular level if it is placed upon its' side.

Correct AnswerverifiedThe plant will experience gravitrophism....View AnswerShow Answer

Which of the following hormones are believed to be involved in abscission?

Correct AnswerverifiedD

In order for hormones like auxin to be used as a chemical signal within a plant it must travel through the xylem to reach the site of activity.

Correct AnswerverifiedShow Answer

Which of the following plant hormones is associated with the closure of stomata in a plant under water stress?

Correct AnswerverifiedShow Answer

How does gibberellin actually work?

Correct AnswerverifiedShow Answer

Went's experiment in 1926 with oat coleoptiles showed that agar that absorbed auxin from the tips would cause a tipless shoot to curve away from the side where he had placed the agar, suggesting that auxin causes cells to elongate.

Correct AnswerverifiedShow Answer

Which of the following plant hormones was studied in the 1880s by Charles and Francis Darwin in experiments on phototropism?

Correct AnswerverifiedShow Answer

Long-day plants flower when the day length is longer than the critical period.

Correct AnswerverifiedTrue

Explain how abscisic acid promotes the closure of stomates. Identify the molecules involved at each step. A. __________ B. __________ C. __________ D. __________

Correct AnswerverifiedA. Abscisic acid binding to its receptor...View AnswerShow Answer

Explain the mechanisms required for a Venus flytrap to close its' trap when stimulated by an insect.

Correct AnswerverifiedTurgor pressure is required to cause the...View AnswerShow Answer

How does auxin actually cause stems to curve towards the light?

Correct AnswerverifiedShow Answer

Which of the following is NOT a physiological change related to photoperiodism?

Correct AnswerverifiedShow Answer

Which of the following plant hormones is associated with the closure of stomata when a plant experiences water stress?

Correct AnswerverifiedShow Answer

The conclusion drawn from these results is that the length of the dark period, not the light period, controls flowering.

Correct AnswerverifiedShow Answer

Which of the following plant hormones stimulates the ripening of fruit and inhibits plant growth?

Correct AnswerverifiedShow Answer

Which of the following plant hormones was discovered in infected rice seedlings that grew extremely tall and slender with "foolish seedling disease"?

Correct AnswerverifiedShow Answer

Plants could readily develop seasonal responses for flowering based on temperature changes but have "elected" through evolution to manage their rhythms based on a comparison of daylight and darkness. Why has the day-night ratio system been selected?

Correct AnswerverifiedShow Answer

Which of the following statements is NOT correct about a circadian rhythm?

Correct AnswerverifiedShow Answer

The germinating corn seed pictured below is displaying

Correct AnswerverifiedShow Answer

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C

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The plant will experience gravitrophism....
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D

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True

Explain how abscisic acid promotes the closure of stomates. Identify the molecules involved at each step. A. B. C. D.

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A. Abscisic acid binding to its receptor...
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Turgor pressure is required to cause the...
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