Question 1

________________ are complex carbohydrates that are released from plant cell walls and appear to regulate both pathogen responses and growth and development in some plants.

Accepted Answer

A)  Brassinosteroids
B)  Oligosaccharides
C)  Cytokinins
D)  Auxins
E)  GlycoproteinsF) B) and E)
G) None of the above

Question 2

A scientist is investigating a hormone response in rose bush stems.The apical meristems of the main stems were removed to allow the lateral buds to develop.What hormone will induce the development of lateral buds once the apical meristems are removed?

Accepted Answer

A)  auxin
B)  cytokinin
C)  gibberellin
D)  abscisic acid
E)  ethyleneF) A) and D)
G) B) and C)

Question 3

The hormone _________ has a more pronounced role in stem elongation if auxin is also present.

Accepted Answer

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

Question 4

When one plant is shaded by another,why is the ratio of far-red to red light increased compared to an unshaded plant?

Accepted Answer

A)  Phytochrome in the taller plant absorbs most of the red light.
B)  Auxin absorbs mostly far-red light.
C)  As light passes through the leaves of the taller plant,most of the red light is absorbed by chlorophyll.
D)  Far-red light mostly reflects off the surface of the soil while red light is mostly absorbeD.
E)  Shade is enriched in far-red wavelengths of light.F) B) and D)
G) C) and E)

Question 5

Turgor movements in plants are responsible for all of the following actions except

Accepted Answer

A)  reversible changes in water pressure within plant cells.
B)  reduction of water loss from transpiration.
C)  folding of leaflets in the Mimosa pudica plants.
D)  flowers that open during the day and close at night.
E)  inducing changes in the active form of phytochromE.F) D) and E)
G) C) and E)

Question 6

All of the following are uses of synthetic auxins,such as NAA and IBA,in agriculture and horticulture except

Accepted Answer

A)  to promote flowering and fruiting in pineapples.
B)  to prevent fruit drop.
C)  to induce formation of roots in plant cuttings.
D)  to prevent leaf and fruit abscission.
E)  to produce bushier plants.F) C) and E)
G) A) and B)

Question 7

What color of light triggers the phototropic response in coleoptiles?

Accepted Answer

A)  blue
B)  green
C)  yellow
D)  red
E)  far-redF) B) and D)
G) B) and C)

Question 8

The plant hormones known as ___________ are structurally similar to animal steroid hormones.

Accepted Answer

A)  brassinosteroids
B)  oligosaccharides
C)  cytokinins
D)  auxins
E)  abscisic acidsF) A) and D)
G) A) and C)

Question 9

During a viticulturist's presentation on growing and managing grapes,why did he state that it is imperative to encourage the grapevine's natural tendency for positive thigmotropism?

Accepted Answer

A)  To encourage the vine's response to move toward the early morning light as opposed to the late afternoon sun.
B)  To encourage the roots to grow deeper and spread out.
C)  To encourage the grapes to retain their sugar for a longer period of time.
D)  To encourage the twining stems to wrap around the supporting wires.
E)  To encourage the self-pruning that is natural to grapevines.F) B) and D)
G) A) and E)

Question 10

Removing the apical bud of a stem usually results in

Accepted Answer

A)  faster flowering.
B)  a bushier plant.
C)  stunted growth.
D)  leaf abscission.
E)  starch accumulation.F) B) and D)
G) A) and E)

Question 11

Mature plants may become __________ in dry or cold seasons in order to survive long periods that are unfavorable for growth.

Accepted Answer

A)  dormant
B)  dehydrated
C)  photoperiodic
D)  thigmonastic
E)  gravitropicF) A) and B)
G) A) and C)

Question 12

When Darwin covered the tip of a grass seedling with metal foil and then illuminated it from one side,what happened to the seedling?

Accepted Answer

A)  It bent away from the directional light.
B)  It did not respond to the directional light.
C)  It grew toward the light,as expected.
D)  It waved back and forth.
E)  It wilted and died.F) A) and E)
G) D) and E)

Question 13

Which of the following statements about gravitropism is false?

Accepted Answer

A)  Shoots exhibit negative gravitropism.
B)  Amyloplasts play a role in perceiving gravity.
C)  Gravitropic responses are evident at germination.
D)  Ethylene is important in plants' responses to gravity.
E)  In roots,the gravity-sensing cells are located in the root cap.F) A) and E)
G) C) and E)

Question 14

A compound similar to auxin,2,4,5-trichlorophenoxyacetic acid (2,4,5-T) ,has been used

Accepted Answer

A)  as a fertilizer for corn and wheat.
B)  as a spray to promote flowering of pineapple.
C)  as an organic substitute for chlorine bleach.
D)  to detoxify the dangerous poison dioxin.
E)  an herbicide for killing weeds and woody seedlings.F) B) and D)
G) A) and C)

Question 15

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) D) and E)
G) C) and D) C

Question 16

Red light and phytochrome are involved in all of the following plant growth responses except

Accepted Answer

A)  thigmotropic responses.
B)  inhibition of seed germination.
C)  elongation of etiolated shoots.
D)  signals for overlapping distances between plants.
E)  photomorphogenesis.F) A) and D)
G) A) and C)

Question 17

Which of the following is not one of the seven major kinds of plant hormones?

Accepted Answer

A)  auxin
B)  nitrogen oxide
C)  cytokinin
D)  gibberellin
E)  ethyleneF) C) and D)
G) D) and E)

Question 18

Which of the following actions is not a major function of auxins?

Accepted Answer

A)  inhibition of leaf abscission
B)  promotion of seed germination
C)  stimulation of the elongation of cells by acting on cell walls
D)  stimulation of the formation of roots on cuttings
E)  promotion of the activity of the vascular cambiumF) C) and D)
G) None of the above

Question 19

Abscisic acid suppresses growth of buds and promotes

Accepted Answer

A)  lengthening.
B)  dormancy.
C)  rolling.
D)  color change.
E)  development.F) A) and E)
G) All of the above B

Question 20

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) D) and E)
G) All of the above B

Exam 41: Sensory Systems in Plants

________________ are complex carbohydrates that are released from plant cell walls and appear to regulate both pathogen responses and growth and development in some plants.

Correct AnswerverifiedShow Answer

A scientist is investigating a hormone response in rose bush stems.The apical meristems of the main stems were removed to allow the lateral buds to develop.What hormone will induce the development of lateral buds once the apical meristems are removed?

Correct AnswerverifiedShow Answer

The hormone _________ has a more pronounced role in stem elongation if auxin is also present.

Correct AnswerverifiedShow Answer

When one plant is shaded by another,why is the ratio of far-red to red light increased compared to an unshaded plant?

Correct AnswerverifiedShow Answer

Turgor movements in plants are responsible for all of the following actions except

Correct AnswerverifiedShow Answer

All of the following are uses of synthetic auxins,such as NAA and IBA,in agriculture and horticulture except

Correct AnswerverifiedShow Answer

What color of light triggers the phototropic response in coleoptiles?

Correct AnswerverifiedShow Answer

The plant hormones known as ___________ are structurally similar to animal steroid hormones.

Correct AnswerverifiedShow Answer

During a viticulturist's presentation on growing and managing grapes,why did he state that it is imperative to encourage the grapevine's natural tendency for positive thigmotropism?

Correct AnswerverifiedShow Answer

Removing the apical bud of a stem usually results in

Correct AnswerverifiedShow Answer

Mature plants may become __________ in dry or cold seasons in order to survive long periods that are unfavorable for growth.

Correct AnswerverifiedShow Answer

When Darwin covered the tip of a grass seedling with metal foil and then illuminated it from one side,what happened to the seedling?

Correct AnswerverifiedShow Answer

Which of the following statements about gravitropism is false?

Correct AnswerverifiedShow Answer

A compound similar to auxin,2,4,5-trichlorophenoxyacetic acid (2,4,5-T) ,has been used

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

Red light and phytochrome are involved in all of the following plant growth responses except

Correct AnswerverifiedShow Answer

Which of the following is not one of the seven major kinds of plant hormones?

Correct AnswerverifiedShow Answer

Which of the following actions is not a major function of auxins?

Correct AnswerverifiedShow Answer

Abscisic acid suppresses growth of buds and promotes

Correct AnswerverifiedB

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

Correct AnswerverifiedB

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C

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B

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B