Question 1

The likely result of treating a shoot cutting with auxin would be

Accepted Answer

A)  root production. 
B)  suppression of apical dominance. 
C)  the growth of lateral buds. 
D)  bolting of the shoot. 
E)  nothing. 
A)  root production. 
B)  suppression of apical dominance. 
C)  the growth of lateral buds. 
D)  bolting of the shoot. 
E)  nothing.

Question 2

Which of the following is not an effect of gibberellins?

Accepted Answer

A)  Promoting seed germination 
B)  Promoting the activity of the aleurone 
C)  Promoting stem elongation 
D)  Promoting senescence 
E)  Promoting fruit enlargement 
A)  Promoting seed germination 
B)  Promoting the activity of the aleurone 
C)  Promoting stem elongation 
D)  Promoting senescence 
E)  Promoting fruit enlargement

Question 3

Suppose you have discovered a new effect of light on some aspect of plant development.How could you most easily show that phytochrome is the photoreceptor?

Accepted Answer

A)  Show that the effect of blue light is stronger than the effect of red light. 
B)  Show that blue light is effective. 
C)  Show that the effect of red light is blocked by exposure of the plant to far-red light afterward. 
D)  Show that green light is effective. 
E)  Show that ultraviolet light is effective. 
A)  Show that the effect of blue light is stronger than the effect of red light. 
B)  Show that blue light is effective. 
C)  Show that the effect of red light is blocked by exposure of the plant to far-red light afterward. 
D)  Show that green light is effective. 
E)  Show that ultraviolet light is effective.

Question 4

Signal transduction for both auxin and gibberellins involves

Accepted Answer

A)  binding of the hormone to a nuclear receptor. 
B)  degradation of a repressor of gene transcription. 
C)  production of a small molecule second messenger. 
D)  light absorption followed by chemical changes. 
E)  breakdown of the hormone. 
A)  binding of the hormone to a nuclear receptor. 
B)  degradation of a repressor of gene transcription. 
C)  production of a small molecule second messenger. 
D)  light absorption followed by chemical changes. 
E)  breakdown of the hormone.

Question 5

A homeowner has set up an outdoor gas-burning grill next to her favorite camellia bush.After the first few nights of using the grill, she notices that the camellia is beginning to lose its leaves.Which statement best explains what is happening?

Accepted Answer

A)  Cytokinins in the plant are activated by the heat of the grill. 
B)  Ethylene is a by-product of the burning gas and is causing senescence in the plant. 
C)  Abscisic acid is a by-product of the burning gas and is causing senescence in the plant. 
D)  The plant is a biennial and is bolting. 
E)  Auxin production is being inhibited. 
A)  Cytokinins in the plant are activated by the heat of the grill. 
B)  Ethylene is a by-product of the burning gas and is causing senescence in the plant. 
C)  Abscisic acid is a by-product of the burning gas and is causing senescence in the plant. 
D)  The plant is a biennial and is bolting. 
E)  Auxin production is being inhibited.

Question 6

Refer to the figure below.   The mutant plant is most likely to have a defect in the signaling pathway for

Accepted Answer

A)  phytochrome Pr. 
B)  phytochrome Pfr. 
C)  zeaxanthin. 
D)  phototropin. 
E)  brassinosteroid. 
A)  phytochrome Pr. 
B)  phytochrome Pfr. 
C)  zeaxanthin. 
D)  phototropin. 
E)  brassinosteroid.

Question 7

Which plant hormone leads to exaggerated apical hook formation?

Accepted Answer

A)  Auxin 
B)  Cytokinin 
C)  Ethylene 
D)  Abscisic acid 
E)  Brassinosteroid 
A)  Auxin 
B)  Cytokinin 
C)  Ethylene 
D)  Abscisic acid 
E)  Brassinosteroid

Question 8

A scientist receives a seed sample from a plant growing in an unknown location and discovers that prolonged cold treatment is needed to break seed dormancy.This suggests that in the native habitat of the plant, the colder part of the year

Accepted Answer

A)  occurs right before the best growing season. 
B)  is favorable for growth. 
C)  lasts for several months. 
D)  is brief. 
E)  is the best source of far-red light. 
A)  occurs right before the best growing season. 
B)  is favorable for growth. 
C)  lasts for several months. 
D)  is brief. 
E)  is the best source of far-red light.

Question 9

Senescence is promoted by which plant hormones?

Accepted Answer

A)  Brassinosteroids 
B)  Auxins 
C)  Gibberellins 
D)  Cytokinins 
E)  Ethylene 
A)  Brassinosteroids 
B)  Auxins 
C)  Gibberellins 
D)  Cytokinins 
E)  Ethylene

Question 10

Beer breweries use gibberellins to ensure consistent germination and liberation of sugars from starch in grain endosperm.Which layer of the grain responds to the applied gibberellins?

Accepted Answer

A)  Mesophyll 
B)  Cotyledon 
C)  Aleurone 
D)  Seed coat 
E)  Embryo 
A)  Mesophyll 
B)  Cotyledon 
C)  Aleurone 
D)  Seed coat 
E)  Embryo

Question 11

Refer to the figure below, showing tomatoes subjected to different conditions.   The green tomatoes on the left were not exposed to a plant hormone, whereas the red tomatoes on the right were most likely treated with _______.

Accepted Answer

The answer of Refer to the figure below, showing tomatoes...

Question 12

Which of the following statements does not describe the signal transduction pathway initiated by the binding of auxin to its receptor protein?

Accepted Answer

A)  Auxin binds to its receptor protein. 
B)  The auxin-receptor complex enters the cell. 
C)  The auxin-receptor complex binds to the repressor and interacts with ubiquitin. 
D)  The repressor is activated, blocking gene expression. 
E)  The repressor is broken down, leading to gene expression. 
A)  Auxin binds to its receptor protein. 
B)  The auxin-receptor complex enters the cell. 
C)  The auxin-receptor complex binds to the repressor and interacts with ubiquitin. 
D)  The repressor is activated, blocking gene expression. 
E)  The repressor is broken down, leading to gene expression.

Question 13

Cytokinins do all of the following except

Accepted Answer

A)  promote cell division. 
B)  promote apical dominance. 
C)  prevent leaf senescence. 
D)  stimulate branching. 
E)  promote shoot bud formation. 
A)  promote cell division. 
B)  promote apical dominance. 
C)  prevent leaf senescence. 
D)  stimulate branching. 
E)  promote shoot bud formation.

Question 14

Auxin inhibits the phenomenon called _______, where separation occurs at the cell layer between petiole and stem, such as in autumn.

Accepted Answer

The answer of Auxin inhibits the phenomenon called _______, where...

Question 15

Seeds from a Mediterranean habitat with frequent fast-burning fires would probably need what treatment to promote their germination?

Accepted Answer

A)  Abrasion 
B)  Anoxia 
C)  Cold 
D)  Extreme hydration 
E)  Smoke 
A)  Abrasion 
B)  Anoxia 
C)  Cold 
D)  Extreme hydration 
E)  Smoke

Question 16

Based on its role in plant signaling, which substance is best described as a hormone?

Accepted Answer

A)  Zeaxanthin 
B)  Auxin 
C)  Phototropin 
D)  Phytochrome 
E)  Cryptochrome 
A)  Zeaxanthin 
B)  Auxin 
C)  Phototropin 
D)  Phytochrome 
E)  Cryptochrome

Question 17

The effect of light on the growth and development of a plant is called

Accepted Answer

A)  photosynthesis. 
B)  photophosphorylation. 
C)  phototropism. 
D)  photomorphogenesis. 
E)  photoinhibition. 
A)  photosynthesis. 
B)  photophosphorylation. 
C)  phototropism. 
D)  photomorphogenesis. 
E)  photoinhibition.

Question 18

Radishes provide a good demonstration of the pronounced swelling that cytokinins can cause in

Accepted Answer

A)  roots. 
B)  stems. 
C)  leaves. 
D)  flowers. 
E)  buds. 
A)  roots. 
B)  stems. 
C)  leaves. 
D)  flowers. 
E)  buds.

Question 19

Absorption of red and far-red light

Accepted Answer

A)  switches the state of phytochrome between two physical forms, Pr and Pfr. 
B)  induces expression of phototropin. 
C)  induces expression of cryptochrome. 
D)  destroys the photoreceptor. 
E)  antagonizes zeaxanthin. 
A)  switches the state of phytochrome between two physical forms, Pr and Pfr. 
B)  induces expression of phototropin. 
C)  induces expression of cryptochrome. 
D)  destroys the photoreceptor. 
E)  antagonizes zeaxanthin.

Question 20

It is thought that cytokinins control growth by cell _______.

Accepted Answer

The answer of It is thought that cytokinins control growth...

Exam 36: Regulation of Plant Growth

The likely result of treating a shoot cutting with auxin would be

Which of the following is not an effect of gibberellins?

Suppose you have discovered a new effect of light on some aspect of plant development.How could you most easily show that phytochrome is the photoreceptor?

Signal transduction for both auxin and gibberellins involves

A homeowner has set up an outdoor gas-burning grill next to her favorite camellia bush.After the first few nights of using the grill, she notices that the camellia is beginning to lose its leaves.Which statement best explains what is happening?

Refer to the figure below. The mutant plant is most likely to have a defect in the signaling pathway for

Which plant hormone leads to exaggerated apical hook formation?

A scientist receives a seed sample from a plant growing in an unknown location and discovers that prolonged cold treatment is needed to break seed dormancy.This suggests that in the native habitat of the plant, the colder part of the year

Senescence is promoted by which plant hormones?

Beer breweries use gibberellins to ensure consistent germination and liberation of sugars from starch in grain endosperm.Which layer of the grain responds to the applied gibberellins?

Refer to the figure below, showing tomatoes subjected to different conditions. The green tomatoes on the left were not exposed to a plant hormone, whereas the red tomatoes on the right were most likely treated with _______.

Which of the following statements does not describe the signal transduction pathway initiated by the binding of auxin to its receptor protein?

Cytokinins do all of the following except

Auxin inhibits the phenomenon called _______, where separation occurs at the cell layer between petiole and stem, such as in autumn.

Seeds from a Mediterranean habitat with frequent fast-burning fires would probably need what treatment to promote their germination?

Based on its role in plant signaling, which substance is best described as a hormone?

The effect of light on the growth and development of a plant is called

Radishes provide a good demonstration of the pronounced swelling that cytokinins can cause in

Absorption of red and far-red light

It is thought that cytokinins control growth by cell _______.

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