Question 1

Which of these is not one of the steps that lead to a gravitropic response in plants?

Accepted Answer

A)  Signals form in the cell that perceives the stimulus.
B)  Differential cell elongation occurs.
C)  Auxin accumulates unevenly on opposite sides of the stem or root,stimulating the bending in response to gravity.
D)  Amyloplasts float upward inside the perceptive cells.
E)  Hormone signals are transported away from the tips of the roots or shoots.F) C) and E)
G) All of the above

Question 2

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) C) and D)
G) A) and C)

Question 3

Which of the following is not a characteristics of cytokinins?

Accepted Answer

A)  stimulate cell division
B)  inhibit growth of lateral roots
C)  related to or derived from adenine
D)  help determine the course of tissue differentiation
E)  accelerate leaf agingF) A) and B)
G) B) and D)

Question 4

If temperatures suddenly rise 5 to 10º C,__________ proteins are produced to help stabilize other proteins.

Accepted Answer

A)  denatured
B)  photosensitive
C)  chilling
D)  heat shock
E)  oxidativeF) C) and E)
G) B) and C)

Question 5

Several scientists,including Charles and Francis Darwin,Frits Went and others,demonstrated that auxins caused stems to bend toward light in a series of elaborate experiments.Went was the researcher who finally determined that bending of the stem toward light was a result of which mechanism?

Accepted Answer

A)  Light caused a reduction in auxin concentration and a reduction in stem elongation on the lighted side of the plant stem,and thus a bending in the direction of the light.
B)  The transport of auxin to the shaded side of the plant stem stimulated stem elongation and a bending in the direction of the light.
C)  Auxin concentration was equal on both sides (lighted and shaded) of the stem;however,the apical meristem responded to the presence of light.
D)  A combination of positive phototropism and a negative gravitropism.
E)  The stems actually were responding to the agar blocks that had been used in the experiments.F) A) and B)
G) C) and E)

Question 6

The plant hormone that is functional as a gas is

Accepted Answer

A)  auxin.
B)  abscisic acid.
C)  cytokinin.
D)  ethylene.
E)  gibberellin.F) None of the above
G) A) and B)

Question 7

Most dwarf plants are mutants that

Accepted Answer

A)  produce too much gibberellin.
B)  cannot produce auxin.
C)  produce too much cytokinin.
D)  have defective auxin receptors.
E)  cannot produce gibberellin.F) A) and B)
G) A) and C)

Question 8

Which of the following statements about hormones is false?

Accepted Answer

A)  They are chemical signals produced in the organism.
B)  They are produced in small,often minute quantities.
C)  They are produced in one part of the organism and transported to another.
D)  Their effect is the same throughout the organism.
E)  They can stimulate certain physiological processes while inhibiting others.F) B) and E)
G) A) and B)

Question 9

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) C) and D)
G) B) and D)

Question 10

Which of the following statements about phytochrome is not true?

Accepted Answer

A)  It exists in two interconvertible forms.
B)  PR absorbs red light.
C)  PFR is biologically inactive.
D)  PFR reverts to PR in the dark.
E)  Several versions of phytochrome exist with overlapping but distinctive functions.F) B) and C)
G) C) and D)

Question 11

Choose the letter of the best match from the following:
-Its defoliant effects were first noticed when it leaked from gas lights;later found to be produced by plants themselves.

Accepted Answer

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

Question 12

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)  phytochrome
E)  gibberellinsF) A) and B)
G) D) and E)

Question 13

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

Accepted Answer

A)  gravitropism
B)  circadian rhythms
C)  phototropism
D)  heat shock
E)  thermotropismF) B) and D)
G) A) and B)

Question 14

Choose the letter of the best match from the following:
-Influential in the opening and closing of stomata.

Accepted Answer

A)  abscisic acid
B)  auxin
C)  ethylene
D)  cytokinin
E)  gibberellinF) A) and B)
G) None of the above

Question 15

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)  ethylene to leaf abscission.F) C) and E)
G) A) and C)

Question 16

What happens when coleoptiles are illuminated with directional light from the side instead of from directly overhead?

Accepted Answer

A)  More auxin is produced.
B)  Less auxin is produced.
C)  Auxin is transported away from the lighted side.
D)  Auxin is transported toward the lighted side.
E)  Auxin receptors are activated.F) B) and C)
G) A) and E)

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)  pudicas
E)  coleoptilesF) B) and C)
G) A) and E)

Question 18

Which of these is not true about gibberellins?

Accepted Answer

A)  They are produced in the apical regions of shoots and roots.
B)  They promote internode elongation.
C)  They can be applied to certain dwarf mutants to restore normal growth and development.
D)  They hasten seed germination.
E)  They inhibit amylases and other hydrolytic enzymes in seeds.F) A) and B)
G) A) and E)

Question 19

Which tropism is not correctly matched with its meaning?

Accepted Answer

A)  phototropism-response to light
B)  gravitropism-response to gravity
C)  thigmotropism-response to touch
D)  thermotropism-response to temperature
E)  heliotropism-response to carbon dioxideF) B) and D)
G) B) and E)

Question 20

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

Exam 41: Sensory Systems in Plants

Which of the following statements about hormones is false?

Correct AnswerverifiedShow Answer

Which of the following is not a characteristics of cytokinins?

Correct AnswerverifiedShow Answer

Choose the letter of the best match from the following: -Its defoliant effects were first noticed when it leaked from gas lights;later found to be produced by plants themselves.

Correct AnswerverifiedShow Answer

Which tropism is not correctly matched with its meaning?

Correct AnswerverifiedShow Answer

Which of the following statements about phytochrome is not true?

Correct AnswerverifiedShow Answer

Which of these is not true about gibberellins?

Correct AnswerverifiedShow Answer

The acid-growth hypothesis links

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The plant hormone that is functional as a gas is

Correct AnswerverifiedShow Answer

Most dwarf plants are mutants that

Correct AnswerverifiedShow Answer

Choose the letter of the best match from the following: -Influential in the opening and closing of stomata.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If temperatures suddenly rise 5 to 10º C,__________ proteins are produced to help stabilize other proteins.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How do nastic movements differ from tropisms?

Correct AnswerverifiedShow Answer

What happens when coleoptiles are illuminated with directional light from the side instead of from directly overhead?

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

Which of these is not one of the steps that lead to a gravitropic response in plants?

Correct AnswerverifiedShow Answer

Several scientists,including Charles and Francis Darwin,Frits Went and others,demonstrated that auxins caused stems to bend toward light in a series of elaborate experiments.Went was the researcher who finally determined that bending of the stem toward light was a result of which mechanism?

Correct AnswerverifiedShow Answer

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