Question 1

The directional growth response of plants to touch is called

Accepted Answer

A)  phototropism.
B)  gravitropism.
C)  thigmotropism.
D)  photoperiodism.
E)  thermotropism.F) B) and E)
G) A) and B)

Question 2

Which of the following traits does not apply to brassinosteroids?

Accepted Answer

A)  They were first discovered in pollen.
B)  They are released from the cell wall by enzymes secreted by pathogens.
C)  Their functions overlap with those of auxins and gibberellins.
D)  Their characteristics are similar to animal steroids.
E)  They may have evolved before the evolutionary divergence of plants and animals.F) B) and C)
G) A) and B)

Question 3

_______________ 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 proteins
E)  PulviniF) A) and E)
G) B) and E)

Question 4

Which of the following statements about phototropisms is false?

Accepted Answer

A)  They mostly occur through a response to green light and an estradiol receptor.
B)  They include bending of plant stems toward light.
C)  Occasionally roots exhibit a weak negative phototropic response.
D)  They help plants position themselves better toward available light.
E)  They can influence the development of plant organs.F) None of the above
G) A) and C)

Question 5

A plant physiologist treats a leaf with abscisic acid and observes that the stomata close.What happened inside the guard cells during the experiment?

Accepted Answer

A)  Abscisic acid influences the movement of sodium ions out of the guard cells.
B)  Abscisic acid influences the movement of potassium ions out of the guard cells.
C)  Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening.
D)  Abscisic acid binds with auxins and induces water molecules to exit the guard cells.
E)  Abscisic acid causes the guard cells to become more turgid.F) All of the above
G) A) and B)

Question 6

Which gaseous hormone stimulates the ripening of fruits?

Accepted Answer

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

Question 7

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)  abscisic acid.F) A) and B)
G) B) and D)

Question 8

Cytokinins promote cell division and differentiation in plant tissues,but only in the presence of what other plant hormone?

Accepted Answer

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

Question 9

Which of the following statements about abscisic acid is false?

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 B)
G) A) and C)

Question 10

When gibberellin binds to its receptor,what happens to activate the gibberellin-dependent transcription factor GA-TRXN?

Accepted Answer

A)  Ethylene is released.
B)  A ubiquitin tag is used to degrade the GA-TRXN inhibitor.
C)  A DELLA protein is degraded,freeing the GA-TRXN.
D)  A DELLA protein is attached to GA-TRXN to activate it.
E)  The gibberellin is transferred to an alternate binding sitE.F) D) and E)
G) B) and C)

Question 11

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) C) and D)

Question 12

Cytokinins are related to or derived from which purine base?

Accepted Answer

A)  adenine
B)  thymine
C)  guanine
D)  cytocine
E)  uracilF) B) and D)
G) A) and E)

Question 13

The elongation of stems is stimulated by

Accepted Answer

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

Question 14

Ethylene plays a number of roles in plants,including all of the following except

Accepted Answer

A)  retarding stem and root elongation.
B)  hastening the ripening of fruits.
C)  increasing the storage life of apples,bananas,and oranges.
D)  accelerating the loss of damaged leaves and fruits.
E)  retarding lateral bud growth.F) C) and D)
G) B) and D)

Question 15

Skototropism is an unusual tropism based on growth toward darkness rather than toward light as in phototropism.Which of these is an example?

Accepted Answer

A)  plants growing in the shade of another plant
B)  germinating seedlings growing through the soil
C)  root tips growing in the soil
D)  vine seedlings on the forest floor searching for tree trunks to climb
E)  night-blooming flowersF) All of the above
G) C) and E)

Question 16

________________ is directional growth responses of plants to a unidirectional source of light.

Accepted Answer

A)  Gravitropism
B)  Thigmotropism
C)  Dormancy
D)  Phototropism
E)  ThermotropismF) All of the above
G) A) and E)

Question 17

Directional,light-triggered plant development is known as

Accepted Answer

A)  thigmotropism.
B)  phototropism.
C)  thigmonasty.
D)  photomorphogenesis.
E)  acid-growth movement.F) A) and B)
G) A) and C)

Question 18

Auxin from the apical bud

Accepted Answer

A)  stimulates the growth of lateral buds.
B)  inhibits the transport of sucrose towards the roots.
C)  stimulates the growth of leaves.
D)  inhibits the growth of lateral buds.
E)  inhibits tip elongation.F) B) and D)
G) A) and E)

Question 19

Choose the letter of the best match from the following:
-A chemical derivative of adenine.

Accepted Answer

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

Question 20

A viticulturist wants to grow larger grapes.A plant physiologist suggests which specific hormone treatment to increase the internode lengths of the plants?

Accepted Answer

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

Exam 41: Sensory Systems in Plants

Cytokinins are related to or derived from which purine base?

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Auxin from the apical bud

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Which gaseous hormone stimulates the ripening of fruits?

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Choose the letter of the best match from the following: -A chemical derivative of adenine.

Correct AnswerverifiedShow Answer

________________ is directional growth responses of plants to a unidirectional source of light.

Correct AnswerverifiedShow Answer

Which of the following statements about phototropisms is false?

Correct AnswerverifiedShow Answer

Which of the following traits does not apply to brassinosteroids?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The elongation of stems is stimulated by

Correct AnswerverifiedShow 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

A viticulturist wants to grow larger grapes.A plant physiologist suggests which specific hormone treatment to increase the internode lengths of the plants?

Correct AnswerverifiedShow Answer

Ethylene plays a number of roles in plants,including all of the following except

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

A plant physiologist treats a leaf with abscisic acid and observes that the stomata close.What happened inside the guard cells during the experiment?

Correct AnswerverifiedShow Answer

Which of the following statements about abscisic acid is false?

Correct AnswerverifiedShow Answer

Cytokinins promote cell division and differentiation in plant tissues,but only in the presence of what other plant hormone?

Correct AnswerverifiedShow Answer

The directional growth response of plants to touch is called

Correct AnswerverifiedShow Answer

When gibberellin binds to its receptor,what happens to activate the gibberellin-dependent transcription factor GA-TRXN?

Correct AnswerverifiedShow Answer

Skototropism is an unusual tropism based on growth toward darkness rather than toward light as in phototropism.Which of these is an example?

Correct AnswerverifiedShow Answer

Directional,light-triggered plant development is known as

Correct AnswerverifiedShow Answer

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