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) All of the above
F) A) and B)

Question 2

The elongation of stems is stimulated by

Accepted Answer

A)  auxin only.
B)  gibberellin only.
C)  ethylene only.
D)  auxin and gibberellin.E) A) and B)
F) A) and C)

Question 3

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 cyclingE) All of the above
F) None of the above

Question 4

Coconut milk was an extremely useful additive in plant tissue culture because, in addition to amino acids, it contains

Accepted Answer

A)  auxins.
B)  gibberellins.
C)  cytokinins.
D)  ethylene.E) A) and D)
F) A) and C)

Question 5

In Arabidopsis plants, about 10% of its genome is devoted to processes tied to which molecule?

Accepted Answer

A)  auxin
B)  ubiquitin
C)  rubisco
D)  phytochromeE) A) and B)
F) A) and C)

Question 6

Gibberellins affect many processes in plants.In seeds embryos, gibberellins are believed to signal hydrolysis of the stored food reserves through inducing the synthesis of the enzyme  α\alphaα -amylase.Which food source are gibberellins targeting with the release of  α\alphaα -amylase?

Accepted Answer

A)  omega-3 fatty acids
B)  starch
C)  glycogen
D)  fructose E) C) and D)
F) B) and C)

Question 7

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) A) and D)
F) All of the above

Question 8

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)  gibberellinE) A) and B)
F) All of the above

Question 9

The acid growth hypothesis links

Accepted Answer

A)  oligosaccharins to pH changes.
B)  cytokinin to thigmonasty.
C)  auxin to cell wall expansion.
D)  gibberellin to root elongation.E) B) and C)
F) C) and D)

Question 10

Why do plants growing outside often have shorter and thicker stems than plants of the same species grown indoors?

Accepted Answer

A)  The plants inside have a more constant source of light and therefore a higher level of phytochrome.
B)  The outdoor plants are subject to mechanical stresses and they are exhibiting a thigmomorphogenic response.
C)  The outdoor plants are subject to touch by animals and other plants and are exhibiting a thigmotropic response.
D)  The indoor plants have elevated levels of auxin and are therefore taller than the outside plants.E) C) and D)
F) All of the above

Question 11

Charles Darwin and his son experimented with which plant growth response?

Accepted Answer

A)  gravitropism
B)  circadian rhythms
C)  phototropism
D)  heat shockE) All of the above
F) A) and D)

Question 12

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) All of the above
F) C) and D)

Question 13

A plant sustains pathogen-induced damage to one of its cell walls.A gene-for-gene response soon follows and the tissue surrounding the injury soon dies.Which signaling molecules facilitated this response?

Accepted Answer

A)  Oligosaccharins
B)  Ethylene
C)  Gibberellins
D)  AuxinsE) B) and C)
F) A) and B)

Question 14

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)  ethyleneE) B) and D)
F) None of the above

Question 15

Red light and phytochrome are involved in which of the following plant growth responses? Check all that apply._____ thigmotropic responses
__X__ inhibition of seed germination
__X__ elongation of etiolated shoots
__X__ detection of crowding by neighboring plants

Accepted Answer

Phytochrome (Section 40.1) is ...

Question 16

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) B) and C)
F) A) and B)

Question 17

Rapid turgor pressure changes in specialized multicellular swellings called ____________ are associated with leaves that move in response to touch or light.

Accepted Answer

A)  petioles
B)  pulvini
C)  stipules
D)  pudicasE) A) and C)
F) A) and B)

Question 18

Abscisic acid (ABA)  is synthesized in the roots in response to decreased soil water potential.ABA then translocates to the leaves, where it rapidly alters the osmotic potential of guard cells.What effect would this have on the stomata and the process of transpiration?

Accepted Answer

A)  The stomata would open thereby increasing the rate of transpiration.
B)  The stomata would open thereby decreasing the rate of transpiration.
C)  The stomata would close thereby decreasing the rate of transpiration.
D)  The stomata would close thereby increasing the rate of transpiration.E) A) and B)
F) None of the above

Question 19

_______________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism, where they bring about physiological responses.

Accepted Answer

A)  Glycoproteins
B)  Photosynthates
C)  Hormones
D)  Heat shock proteinsE) A) and D)
F) B) and D)

Question 20

A viticulturist wants to grow larger grapes.Which specific hormone would a viticulturist apply to the plants?

Accepted Answer

A)  auxin
B)  cytokinin
C)  gibberellin
D)  abscisic acidE) A) and D)
F) A) and B)

Exam 40: Sensory Systems in Plants

Charles Darwin and his son experimented with which plant growth response?

Correct Answer
verified

The acid growth hypothesis links

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Why do plants growing outside often have shorter and thicker stems than plants of the same species grown indoors?

Correct Answer
verified

The elongation of stems is stimulated by

Correct Answer
verified

Coconut milk was an extremely useful additive in plant tissue culture because, in addition to amino acids, it contains

Correct Answer
verified

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

Correct Answer
verified

A plant sustains pathogen-induced damage to one of its cell walls.A gene-for-gene response soon follows and the tissue surrounding the injury soon dies.Which signaling molecules facilitated this response?

Correct Answer
verified

A viticulturist wants to grow larger grapes.Which specific hormone would a viticulturist apply to the plants?

Correct Answer
verified

Red light and phytochrome are involved in which of the following plant growth responses? Check all that apply._ thigmotropic responses X inhibition of seed germination X elongation of etiolated shoots X detection of crowding by neighboring plants

Correct Answer
verified
Phytochrome (Section 40.1) is ...
View Answer

_______________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism, where they bring about physiological responses.

Correct Answer
verified

Abscisic acid (ABA) is synthesized in the roots in response to decreased soil water potential.ABA then translocates to the leaves, where it rapidly alters the osmotic potential of guard cells.What effect would this have on the stomata and the process of transpiration?

Correct Answer
verified

Gibberellins affect many processes in plants.In seeds embryos, gibberellins are believed to signal hydrolysis of the stored food reserves through inducing the synthesis of the enzyme $\alpha$ -amylase.Which food source are gibberellins targeting with the release of $\alpha$ -amylase?

Correct Answer
verified

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

Correct Answer
verified

Rapid turgor pressure changes in specialized multicellular swellings called ____________ are associated with leaves that move in response to touch or light.

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

How do nastic movements differ from tropisms?

Correct Answer
verified

In Arabidopsis plants, about 10% of its genome is devoted to processes tied to which molecule?

Correct Answer
verified

Exam 40: Sensory Systems in Plants

Charles Darwin and his son experimented with which plant growth response?

Correct AnswerverifiedShow Answer

The acid growth hypothesis links

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Why do plants growing outside often have shorter and thicker stems than plants of the same species grown indoors?

Correct AnswerverifiedShow Answer

The elongation of stems is stimulated by

Correct AnswerverifiedShow Answer

Coconut milk was an extremely useful additive in plant tissue culture because, in addition to amino acids, it contains

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A plant sustains pathogen-induced damage to one of its cell walls.A gene-for-gene response soon follows and the tissue surrounding the injury soon dies.Which signaling molecules facilitated this response?

Correct AnswerverifiedShow Answer

A viticulturist wants to grow larger grapes.Which specific hormone would a viticulturist apply to the plants?

Correct AnswerverifiedShow Answer

Red light and phytochrome are involved in which of the following plant growth responses? Check all that apply._____ thigmotropic responses __X__ inhibition of seed germination __X__ elongation of etiolated shoots __X__ detection of crowding by neighboring plants

Correct AnswerverifiedPhytochrome (Section 40.1) is ...View AnswerShow Answer

_______________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism, where they bring about physiological responses.

Correct AnswerverifiedShow Answer

Abscisic acid (ABA) is synthesized in the roots in response to decreased soil water potential.ABA then translocates to the leaves, where it rapidly alters the osmotic potential of guard cells.What effect would this have on the stomata and the process of transpiration?

Correct AnswerverifiedShow Answer

Gibberellins affect many processes in plants.In seeds embryos, gibberellins are believed to signal hydrolysis of the stored food reserves through inducing the synthesis of the enzyme α\alphaα -amylase.Which food source are gibberellins targeting with the release of α\alphaα -amylase?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Rapid turgor pressure changes in specialized multicellular swellings called ____________ are associated with leaves that move in response to touch or light.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How do nastic movements differ from tropisms?

Correct AnswerverifiedShow Answer

In Arabidopsis plants, about 10% of its genome is devoted to processes tied to which molecule?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Red light and phytochrome are involved in which of the following plant growth responses? Check all that apply._ thigmotropic responses X inhibition of seed germination X elongation of etiolated shoots X detection of crowding by neighboring plants

Correct Answer
verified
Phytochrome (Section 40.1) is ...
View Answer

Correct Answer
verified

Correct Answer
verified

Gibberellins affect many processes in plants.In seeds embryos, gibberellins are believed to signal hydrolysis of the stored food reserves through inducing the synthesis of the enzyme $\alpha$ -amylase.Which food source are gibberellins targeting with the release of $\alpha$ -amylase?

Correct Answer
verified

Correct Answer
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Correct Answer
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