Question 1

How do nastic movements differ from tropisms?

Accepted Answer

A)  Nastic movements are slower than tropisms.
B)  Nastic movements only occur in the dark.
C)  Tropisms are directional responses to directional stimuli; nastic movements are the same regardless of the direction of the stimulus.
D)  Nastic movements happen after a stimulus,tropisms happen during a stimulus.
E)  Nastic movements are not reversible.F) B) and E)
G) A) and B)

Question 2

What endogenous process helps plants to keep their movements and other responses synchronized with the environment?

Accepted Answer

A)  purine monitoring
B)  solar tracking
C)  a circadian clock
D)  auxin cycling
E)  gravitropismF) B) and E)
G) None of the above

Question 3

Before ARF transcription factors can trigger auxin-induced gene expression,what must happen?

Accepted Answer

A)  Auxin binds to ubiquitin,a degradation tag.
B)  Auxin degrades Aux/IAA proteins which repress ARF transcription factors.
C)  Auxin binds to TIR1,an auxin receptor.
D)  Auxin must bind to the ARF transcription factor.
E)  Ubiquitin must destroy TIR1 to release Aux/IAA proteins.F) C) and D)
G) A) and D)

Question 4

In some genetically engineered tomatoes,fruit ripening was delayed by crippling the gene that produces which hormone?

Accepted Answer

A)  auxin
B)  ethylene
C)  abscisic acid
D)  gibberellin
E)  cytokininF) A) and D)
G) A) and C)

Question 5

While touring the ancient Egypt exhibit at the local history museum,you learn that ancient Egyptians would slash figs in order to stimulate ripening.Based on your knowledge of plant hormones you hypothesize that wounding the figs must release

Accepted Answer

A)  abscisic acid.
B)  gibberellin.
C)  indoleacetic acid.
D)  ethylene.
E)  cytokinin.F) B) and C)
G) A) and E)

Question 6

Which naturally-occurring plant hormone has a major role in the phototropic response of plants?

Accepted Answer

A)  auxin
B)  gibberellin
C)  abscisic acid
D)  ethylene
E)  2,4-DF) D) and E)
G) None of the above

Question 7

Research has shown that cytokinin levels fluctuate seasonally in temperate plants.What season would you expect to see the lowest levels of cytokinins and why would this be adaptive?

Accepted Answer

A)  Spring,because lower levels of cytokinin allow auxin to promote rapid growth in stem height.This will allow the plant to compete effectively for sunlight.
B)  Summer,because lower levels of cytokinin would slow growth down and delay leaf aging.This will allow the plant to maximize the production of starch and increase it's sugar reserves.This will help ensure the plant's survival through Autumn and Winter.
C)  Autumn,because lower levels of cytokinin at this time of year will induce the production of ethylene.This will result in maturation of fruit and ensure effective seed dispersal before Winter.
D)  Winter,because lower levels of cytokinin will place buds into a dormant state.This will protect the underlying tissues from freezing until Spring.E) A) and D)
F) C) and D)

Question 8

Climbing plants,such as vines,rely on touch to navigate and develop tendrils that coil around objects they encounter.Roots also rely on touch to navigate their way through the soil.When roots come into contact with an object,they generally grow in a direction away from the object.Based on this information,which of the following statements is true?

Accepted Answer

A)  Both tendrils and roots are displaying thigmonastic responses to an object in the environment.
B)  The tendrils are displaying a thigmonastic response while the roots are displaying a thigmotropic response.
C)  The tendrils are displaying a positive thigmotropic response while the roots are displaying a negative thigmotropic response.
D)  The tendrils are displaying a thigmotropic response while the roots are displaying a thigmonastic response.
E)  The tendrils are displaying a negative thigmotropic response while the roots are displaying a positive thigmotropic response.F) A) and D)
G) D) and E)

Question 9

One effect of auxin,which triggers the elongation of cells,is to affect cell walls by increasing their

Accepted Answer

A)  permeability.
B)  plasticity.
C)  stiffness.
D)  thickness.
E)  water solubility.F) A) and E)
G) A) and B)

Question 10

Which of the following statements about abscisic acid are true? Check all that apply.

Accepted Answer

A)  It is produced chiefly in mature green leaves and in fruits.
B)  It stimulates the growth of dormant buds.
C)  It promotes leaf senescence.
D)  It plays an important role in controlling the opening and closing of stomata.
E)  It plays a role in seed dormancy.F) A) and D)
G) A) and B)

Exam 39: Sensory Systems in Plants

Research has shown that cytokinin levels fluctuate seasonally in temperate plants.What season would you expect to see the lowest levels of cytokinins and why would this be adaptive?

Correct Answer
verified

Correct Answer
verified

While touring the ancient Egypt exhibit at the local history museum,you learn that ancient Egyptians would slash figs in order to stimulate ripening.Based on your knowledge of plant hormones you hypothesize that wounding the figs must release

Correct Answer
verified

How do nastic movements differ from tropisms?

Correct Answer
verified

One effect of auxin,which triggers the elongation of cells,is to affect cell walls by increasing their

Correct Answer
verified

Which naturally-occurring plant hormone has a major role in the phototropic response of plants?

Correct Answer
verified

Which of the following statements about abscisic acid are true? Check all that apply.

Correct Answer
verified

In some genetically engineered tomatoes,fruit ripening was delayed by crippling the gene that produces which hormone?

Correct Answer
verified

Before ARF transcription factors can trigger auxin-induced gene expression,what must happen?

Correct Answer
verified

What endogenous process helps plants to keep their movements and other responses synchronized with the environment?

Correct Answer
verified

Exam 39: Sensory Systems in Plants

Research has shown that cytokinin levels fluctuate seasonally in temperate plants.What season would you expect to see the lowest levels of cytokinins and why would this be adaptive?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

While touring the ancient Egypt exhibit at the local history museum,you learn that ancient Egyptians would slash figs in order to stimulate ripening.Based on your knowledge of plant hormones you hypothesize that wounding the figs must release

Correct AnswerverifiedShow Answer

How do nastic movements differ from tropisms?

Correct AnswerverifiedShow Answer

One effect of auxin,which triggers the elongation of cells,is to affect cell walls by increasing their

Correct AnswerverifiedShow Answer

Which naturally-occurring plant hormone has a major role in the phototropic response of plants?

Correct AnswerverifiedShow Answer

Which of the following statements about abscisic acid are true? Check all that apply.

Correct AnswerverifiedShow Answer

In some genetically engineered tomatoes,fruit ripening was delayed by crippling the gene that produces which hormone?

Correct AnswerverifiedShow Answer

Before ARF transcription factors can trigger auxin-induced gene expression,what must happen?

Correct AnswerverifiedShow Answer

What endogenous process helps plants to keep their movements and other responses synchronized with the environment?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified