Question 1

If cells in the ________ are removed, roots will no longer respond to gravity.

Accepted Answer

A)   root hairs
B)   zone of elongation
C)   root cap
D)   secondary meristemE) None of the above
F) C) and D)

Question 2

Which of the following signals indicates shade to a plant?

Accepted Answer

A)   light quantity
B)   blue light
C)   far-red light
D)   red lightE) A) and B)
F) A) and C)

Question 3

The aleurone layer is stimulated to release ________ as a result of gibberellin release from the embryo.

Accepted Answer

A)   amino acids
B)   carbohydrates
C)   cytokinins
D)   amylase
E)   RNAaseF) D) and E)
G) A) and C)

Question 4

When an arborist prunes a limb off a valuable tree, he or she may paint the cut surface with a nontoxic sealant. The primary purpose of the paint is to ________.

Accepted Answer

A)   minimize water loss by evaporation from the cut surface
B)   improve the appearance of the cut surface
C)   stimulate growth of the cork cambium to heal the wound
D)   block entry of pathogens through the wound
E)   induce the production of proteinase inhibitorsF) A) and B)
G) A) and C)

Question 5

A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely ________.

Accepted Answer

A)   cause increased flower production
B)   have no effect upon flowering
C)   inhibit flowering
D)   stimulate flowering
E)   convert florigen to the active formF) All of the above
G) B) and E)

Question 6

A plant mutant that shows normal gravitropic bending but does not store starch in its plastids would require a reevaluation of the role of ________ in gravitropism.

Accepted Answer

A)   auxin
B)   calcium
C)   amyloplasts
D)   light
E)   differential growthF) B) and C)
G) D) and E)

Question 7

Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. Which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?

Accepted Answer

A)   auxin and phytochrome
B)   auxin and Pfr
C)   Pfr and phytochrome
D)   cytokinins and phototropins
E)   abscisic acid (AB
A)   and PfrF) None of the above
G) A) and B)

Question 8

Which of the following hormones would be most useful in promoting the rooting of plant cuttings?

Accepted Answer

A)   ethylene
B)   abscisic acid
C)   cytokinins
D)   gibberellins
E)   auxinsF) A) and B)
G) D) and E)

Question 9

Plant hormonal regulation differs from animal hormonal regulation in that ________.

Accepted Answer

A)   there are no dedicated hormone-producing organs in plants as there are in animals
B)   all production of hormones is local in plants with little long-distance transport
C)   plants do not exhibit feedback mechanisms like animals
D)   only animal hormone concentrations are developmentally regulated
E)   only animal hormones may have either external or internal receptorsF) A) and B)
G) B) and E)

Question 10

A plant seedling bends toward sunlight because ________.

Accepted Answer

A)   auxin migrates to the lower part of the stem due to gravity
B)   there is more auxin on the light side of the stem
C)   auxin is destroyed more quickly on the dark side of the stem
D)   auxin is found in greatest abundance on the dark side of the stem
E)   gibberellins produced at the stem tip cause phototropismF) A) and B)
G) C) and D)

Question 11

Which of the following can be sensed by plants?
I. gravity
II. pathogens
III. wind
IV. light

Accepted Answer

A)   only I and III
B)   only III and IV
C)   only I, II, and IV
D)   only II, III, and IV
E)   I, II, III, and IVF) A) and B)
G) A) and C)

Question 12

If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants' environment?

Accepted Answer

A)   carbon dioxide
B)   cytokinins
C)   ethylene
D)   auxin
E)   gibberellic acidsF) A) and E)
G) A) and C)

Question 13

Charles and Francis Darwin concluded from their experiments on phototropism by grass seedlings that the part of the seedling that detects the direction of light is the ________.

Accepted Answer

A)   tip of the coleoptile
B)   elongating cells in the coleoptile
C)   base of the coleoptile
D)   cotyledon
E)   phytochrome in the coleoptileF) A) and E)
G) B) and D)

Question 14

Use the following information to answer the question below.
Some plants continually produce secondary defense compounds. Other plants are induced to form secondary defense compounds when they are injured. Corn seedling leaves that are chewed on by the caterpillars of a type of cutworm moth emit immediate volatile chemicals (LOX products) , and after 6 hours large amounts of terpenoid compounds are released into the air. The terpenoids are released not only from the leaf being chewed but from all leaves of the plant. The terpenoid compounds attract a parasitoid wasp female that lays her eggs on the caterpillar. When the wasp larvae hatch, they eat and kill the moth caterpillar. (T.C.J. Turlings, J. H. Loughrin, P. J. McCall, U. S. R. Rose, W. J. Lewis, and J. H. Tumlinson. 1995. How caterpillar-damaged plants protect themselves by attracting parasitic wasps. 
Refer to the paragraph on how caterpillar-damaged plants protect themselves by attracting parasitic wasps. What can you conclude based only on the information in the preceding paragraph?

Accepted Answer

A)   The attracting terpenoid compounds are always present in the corn seedling.
B)   Physical injury by the caterpillar mouthparts results in the immediate release of terpenoids.
C)   Chemical signals from the caterpillar saliva attract the parasitic wasp.
D)   The parasitoid wasp is attracted by compounds produced by an injured corn plant.
E)   LOX products and terpenoids are the same kinds of chemical compounds.F) A) and D)
G) A) and C)

Question 15

What do thigmomorphogenesis, thigmotropism, and thigmonastic movements have in common?

Accepted Answer

A)   All three plant responses are mediated by auxins.
B)   All three plant responses are plant responses to touch.
C)   All three plant responses alter the direction of stem growth.
D)   In all three plant responses, gene transcription is altered in response to touch.E) A) and B)
F) B) and C)

Question 16

Which of the following treatments would increase the level of the Pfr form of phytochrome?

Accepted Answer

A)   exposure to far-red light
B)   exposure to red light
C)   a long dark period
D)   inhibition of protein synthesis
E)   synthesis of phosphorylating enzymesF) A) and E)
G) A) and D)

Question 17

Which of the following conclusions is supported by the research of both Went and Charles and Francis Darwin on shoot responses to light?

Accepted Answer

A)   When shoots are exposed to light, a chemical substance migrates toward the light.
B)   Agar contains a chemical substance that mimics a plant hormone.
C)   A chemical substance involved in shoot bending is produced in shoot tips.
D)   Once shoot tips have been cut, normal growth cannot be induced.
E)   Cells on the shaded side of the coleoptile elongate in response to auxin.F) D) and E)
G) A) and C)

Question 18

Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun. To reach a large tree, the most useful kind of growth movement for a tropical vine presumably would be ________.

Accepted Answer

A)   negative thigmotropism
B)   negative phototropism
C)   negative gravitropism
D)   positive thigmomorphogenesis
E)   the opposite of circadian rhythmsF) None of the above
G) A) and B)

Question 19

Many plants are capable of responding very rapidly to mechanical stimuli. For instance, Venus Flytraps respond more quickly than their insect prey can escape. A very mild touch or a light breeze can cause the leaves of the Sensitive Plant to close tightly. This rapid transmission of touch is accomplished by ________.

Accepted Answer

A)   rapid changes in phloem pressure
B)   efficient, rapid transport of auxin
C)   self-propagating changes in membrane potential
D)   release of volatile airborne signals
E)   All of the above are employed by these plants.F) A) and C)
G) A) and B)

Question 20

A short-day plant will flower only when ________.

Accepted Answer

A)   days are shorter than nights
B)   days are shorter than a certain critical value
C)   nights are shorter than days
D)   days and nights are of equal lengthE) B) and D)
F) None of the above

Exam 37: Plant Sensory Systems, Signals, and Responses

A plant seedling bends toward sunlight because ________.

Correct Answer
verified

A short-day plant will flower only when ________.

Correct Answer
verified

When an arborist prunes a limb off a valuable tree, he or she may paint the cut surface with a nontoxic sealant. The primary purpose of the paint is to ________.

Correct Answer
verified

Which of the following can be sensed by plants? I. gravity II. pathogens III. wind IV. light

Correct Answer
verified

Charles and Francis Darwin concluded from their experiments on phototropism by grass seedlings that the part of the seedling that detects the direction of light is the ________.

Correct Answer
verified

Which of the following hormones would be most useful in promoting the rooting of plant cuttings?

Correct Answer
verified

The aleurone layer is stimulated to release ________ as a result of gibberellin release from the embryo.

Correct Answer
verified

If cells in the ________ are removed, roots will no longer respond to gravity.

Correct Answer
verified

If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants' environment?

Correct Answer
verified

Plant hormonal regulation differs from animal hormonal regulation in that ________.

Correct Answer
verified

Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. Which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?

Correct Answer
verified

A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely ________.

Correct Answer
verified

Correct Answer
verified

What do thigmomorphogenesis, thigmotropism, and thigmonastic movements have in common?

Correct Answer
verified

Correct Answer
verified

Which of the following signals indicates shade to a plant?

Correct Answer
verified

Which of the following treatments would increase the level of the Pfr form of phytochrome?

Correct Answer
verified

Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun. To reach a large tree, the most useful kind of growth movement for a tropical vine presumably would be ________.

Correct Answer
verified

Which of the following conclusions is supported by the research of both Went and Charles and Francis Darwin on shoot responses to light?

Correct Answer
verified

A plant mutant that shows normal gravitropic bending but does not store starch in its plastids would require a reevaluation of the role of ________ in gravitropism.

Correct Answer
verified

Exam 37: Plant Sensory Systems, Signals, and Responses

A plant seedling bends toward sunlight because ________.

Correct AnswerverifiedShow Answer

A short-day plant will flower only when ________.

Correct AnswerverifiedShow Answer

When an arborist prunes a limb off a valuable tree, he or she may paint the cut surface with a nontoxic sealant. The primary purpose of the paint is to ________.

Correct AnswerverifiedShow Answer

Which of the following can be sensed by plants? I. gravity II. pathogens III. wind IV. light

Correct AnswerverifiedShow Answer

Charles and Francis Darwin concluded from their experiments on phototropism by grass seedlings that the part of the seedling that detects the direction of light is the ________.

Correct AnswerverifiedShow Answer

Which of the following hormones would be most useful in promoting the rooting of plant cuttings?

Correct AnswerverifiedShow Answer

The aleurone layer is stimulated to release ________ as a result of gibberellin release from the embryo.

Correct AnswerverifiedShow Answer

If cells in the ________ are removed, roots will no longer respond to gravity.

Correct AnswerverifiedShow Answer

If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants' environment?

Correct AnswerverifiedShow Answer

Plant hormonal regulation differs from animal hormonal regulation in that ________.

Correct AnswerverifiedShow Answer

Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. Which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?

Correct AnswerverifiedShow Answer

A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely ________.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What do thigmomorphogenesis, thigmotropism, and thigmonastic movements have in common?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following signals indicates shade to a plant?

Correct AnswerverifiedShow Answer

Which of the following treatments would increase the level of the Pfr form of phytochrome?

Correct AnswerverifiedShow Answer

Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun. To reach a large tree, the most useful kind of growth movement for a tropical vine presumably would be ________.

Correct AnswerverifiedShow Answer

Which of the following conclusions is supported by the research of both Went and Charles and Francis Darwin on shoot responses to light?

Correct AnswerverifiedShow Answer

A plant mutant that shows normal gravitropic bending but does not store starch in its plastids would require a reevaluation of the role of ________ in gravitropism.

Correct AnswerverifiedShow Answer

Correct Answer
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