Question 1

Which statement does not describe an observation in studies of the hormone gibberellin?

Accepted Answer

A)  The gibberellin content of wild-type (nondwarf) strains was determined to be much higher than that in dwarf strains. 
B)  Dwarf strains grew normally if additional fertilizer was applied. 
C)  Application of gibberellin promoted growth of dwarf strains. 
D)  Gibberellin may also be made by a fungus. 
E)  Too much gibberellin can cause disease. 
A)  The gibberellin content of wild-type (nondwarf) strains was determined to be much higher than that in dwarf strains. 
B)  Dwarf strains grew normally if additional fertilizer was applied. 
C)  Application of gibberellin promoted growth of dwarf strains. 
D)  Gibberellin may also be made by a fungus. 
E)  Too much gibberellin can cause disease.

Question 2

To study the actions of plant hormones, it is useful to expose seeds to a mutagen, raise them up, and identify individuals that behave differently from typical plants.This process is called a(n) _______.

Accepted Answer

The answer of To study the actions of plant hormones,...

Question 3

The semi-dwarf wheat and rice plants that led to the Green Revolution described in the chapter opening have mutations in the signal transduction pathway for gibberellins.You wish to use genetic engineering to make corn plants that are semi-dwarf.How would you do a genetic screen to identify the genes in corn involved in gibberellin signaling?

Accepted Answer

Add a mutagen to hundreds of c

Question 4

Silver thiosulfate, used by florists, is an antagonist of what plant hormone?

Accepted Answer

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

Question 5

Which type of mutant Arabidopsis plants were used to study the mechanics behind phototropism?

Accepted Answer

A)  Dwarf plants 
B)  Plants insensitive to ethylene 
C)  Plants that do not make auxin 
D)  Plants insensitive to blue light signals 
E)  Plants insensitive to far-red signals 
A)  Dwarf plants 
B)  Plants insensitive to ethylene 
C)  Plants that do not make auxin 
D)  Plants insensitive to blue light signals 
E)  Plants insensitive to far-red signals

Question 6

One manifestation of a(n) _______ in bean plants is the raising and lowering of its leaves.

Accepted Answer

The answer of One manifestation of a(n) _______ in bean...

Question 7

Which scenario is an example of seed quiescence?

Accepted Answer

A)  A tomato seed does not generally germinate while still attached to its parent plant. 
B)  A wildflower seed is exposed to the correct temperature and moisture conditions for germination, but it does not germinate until it receives appropriate light-related cues. 
C)  A juniper seed passes through the digestive tract of a bird to be deposited far from the shade of its parent plant. 
D)  A banana produces sterile fruit without first being pollinated. 
E)  The still-viable seed of a water-loving lotus plant has been buried in dry soils for decades. 
A)  A tomato seed does not generally germinate while still attached to its parent plant. 
B)  A wildflower seed is exposed to the correct temperature and moisture conditions for germination, but it does not germinate until it receives appropriate light-related cues. 
C)  A juniper seed passes through the digestive tract of a bird to be deposited far from the shade of its parent plant. 
D)  A banana produces sterile fruit without first being pollinated. 
E)  The still-viable seed of a water-loving lotus plant has been buried in dry soils for decades.

Question 8

Which statement about the effects of plant hormones and photoreceptors on plant growth is false?

Accepted Answer

A)  Some hormones affect all aspects of plant growth and development. 
B)  Phytochrome is a green light receptor. 
C)  Photoreceptors, pigment-protein complexes, regulate plant growth. 
D)  Hormones and photoreceptors activate signal transduction pathways. 
E)  Hormones can act on parts of a plant that are quite distant from their sites of synthesis. 
A)  Some hormones affect all aspects of plant growth and development. 
B)  Phytochrome is a green light receptor. 
C)  Photoreceptors, pigment-protein complexes, regulate plant growth. 
D)  Hormones and photoreceptors activate signal transduction pathways. 
E)  Hormones can act on parts of a plant that are quite distant from their sites of synthesis.

Question 9

Apical dominance is most strengthened by

Accepted Answer

A)  removal of the stem tip. 
B)  auxin production. 
C)  removal of leaves. 
D)  production of fruits. 
E)  removal of fruits. 
A)  removal of the stem tip. 
B)  auxin production. 
C)  removal of leaves. 
D)  production of fruits. 
E)  removal of fruits.

Question 10

Treatment of seeds that require light for germination with _______ would promote germination.

Accepted Answer

A)  blue light 
B)  red light 
C)  far-red light 
D)  red light then far-red light 
E)  blue light then far-red light 
A)  blue light 
B)  red light 
C)  far-red light 
D)  red light then far-red light 
E)  blue light then far-red light

Question 11

The physiologically active form of phytochrome

Accepted Answer

A)  is Pfr. 
B)  is Pr. 
C)  is located in the cell membrane. 
D)  absorbs red light. 
E)  is 730 nm in diameter. 
A)  is Pfr. 
B)  is Pr. 
C)  is located in the cell membrane. 
D)  absorbs red light. 
E)  is 730 nm in diameter.

Question 12

Which of the following hormones would you apply to a dwarf plant to increase its height?

Accepted Answer

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

Question 13

Refer to the figure below showing a signal reception pathway.   Predict what is most likely to happen when the relevant hormone (e.g., auxin or gibberellin) is present.

Accepted Answer

A)  The plant grows taller. 
B)  The plant produces more branches. 
C)  The plant loses its leaves. 
D)  The plant leans away from a light source (negative phototropism). 
E)  The fruit is released prematurely by the parent plant. 
A)  The plant grows taller. 
B)  The plant produces more branches. 
C)  The plant loses its leaves. 
D)  The plant leans away from a light source (negative phototropism). 
E)  The fruit is released prematurely by the parent plant.

Question 14

A botanist is performing an experiment on some cactus plants that have small, rounded extensions from their flattened stems.Suspecting that these extensions are reduced, modified leaves, the scientist treats the plants with _______ to see if these leaves abscise normally.

Accepted Answer

The answer of A botanist is performing an experiment on...

Question 15

Upon observing the early stages of seed germination, one would expect to see what emerging from the seed coat?

Accepted Answer

A)  Radicle 
B)  Plumule 
C)  Radix 
D)  Leaf 
E)  Cotyledon 
A)  Radicle 
B)  Plumule 
C)  Radix 
D)  Leaf 
E)  Cotyledon

Question 16

Auxin promotes plant cell growth by

Accepted Answer

A)  enhancing cell division. 
B)  enhancing cell expansion. 
C)  thickening cell walls. 
D)  causing hydroxide ions to be released from the cells. 
E)  stimulating cytokinin synthesis. 
A)  enhancing cell division. 
B)  enhancing cell expansion. 
C)  thickening cell walls. 
D)  causing hydroxide ions to be released from the cells. 
E)  stimulating cytokinin synthesis.

Question 17

The pigment protein phytochrome is thought to allow plants to detect photoperiod because

Accepted Answer

A)  it can be converted into two different forms depending on the specific wavelengths of light that it absorbs. 
B)  it absorbs red light during the day and breaks down in darkness. 
C)  the photoperiod response depends on how much light is absorbed by phytochrome. 
D)  the pigment becomes inactive in the dark. 
E)  the pigment response can be observed only in intact living plants. 
A)  it can be converted into two different forms depending on the specific wavelengths of light that it absorbs. 
B)  it absorbs red light during the day and breaks down in darkness. 
C)  the photoperiod response depends on how much light is absorbed by phytochrome. 
D)  the pigment becomes inactive in the dark. 
E)  the pigment response can be observed only in intact living plants.

Question 18

Experimental removal of the auxin source demonstrates that leaf abscission is _______ by auxin, and apical dominance is _______ by auxin.

Accepted Answer

A)  promoted; also promoted 
B)  inhibited; also inhibited 
C)  promoted; inhibited 
D)  inhibited; promoted 
E)  promoted; unaffected 
A)  promoted; also promoted 
B)  inhibited; also inhibited 
C)  promoted; inhibited 
D)  inhibited; promoted 
E)  promoted; unaffected

Question 19

Etiolated seedlings are produced by germinating seeds that are kept in total darkness.Plants that are kept in the dark will begin to synthesize chlorophyll after they are given a pulse of

Accepted Answer

A)  blue light. 
B)  red light. 
C)  red light followed by a pulse of far-red light. 
D)  far-red light followed by a pulse of red light. 
E)  ultraviolet light. 
A)  blue light. 
B)  red light. 
C)  red light followed by a pulse of far-red light. 
D)  far-red light followed by a pulse of red light. 
E)  ultraviolet light.

Question 20

Seedless grapes sold in stores would be much smaller if not for the use of

Accepted Answer

A)  auxins. 
B)  gibberellins. 
C)  ethylene. 
D)  brassinosteroids. 
E)  cytokinins. 
A)  auxins. 
B)  gibberellins. 
C)  ethylene. 
D)  brassinosteroids. 
E)  cytokinins.

Exam 36: Regulation of Plant Growth

Which statement does not describe an observation in studies of the hormone gibberellin?

To study the actions of plant hormones, it is useful to expose seeds to a mutagen, raise them up, and identify individuals that behave differently from typical plants.This process is called a(n) _______.

Silver thiosulfate, used by florists, is an antagonist of what plant hormone?

Which type of mutant Arabidopsis plants were used to study the mechanics behind phototropism?

One manifestation of a(n) _______ in bean plants is the raising and lowering of its leaves.

Which scenario is an example of seed quiescence?

Which statement about the effects of plant hormones and photoreceptors on plant growth is false?

Apical dominance is most strengthened by

Treatment of seeds that require light for germination with _______ would promote germination.

The physiologically active form of phytochrome

Which of the following hormones would you apply to a dwarf plant to increase its height?

Refer to the figure below showing a signal reception pathway. Predict what is most likely to happen when the relevant hormone (e.g., auxin or gibberellin) is present.

A botanist is performing an experiment on some cactus plants that have small, rounded extensions from their flattened stems.Suspecting that these extensions are reduced, modified leaves, the scientist treats the plants with _______ to see if these leaves abscise normally.

Upon observing the early stages of seed germination, one would expect to see what emerging from the seed coat?

Auxin promotes plant cell growth by

The pigment protein phytochrome is thought to allow plants to detect photoperiod because

Experimental removal of the auxin source demonstrates that leaf abscission is _______ by auxin, and apical dominance is _______ by auxin.

Etiolated seedlings are produced by germinating seeds that are kept in total darkness.Plants that are kept in the dark will begin to synthesize chlorophyll after they are given a pulse of

Seedless grapes sold in stores would be much smaller if not for the use of

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Experimental removal of the auxin source demonstrates that leaf abscission is _ by auxin, and apical dominance is _ by auxin.