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Biology, 6/e
Author Dr. George B. Johnson, Washington University
Author Dr. Peter H. Raven, Missouri Botanical Gardens & Washington University
Contributor Dr. Susan Singer, Carleton College
Contributor Dr. Jonathan Losos, Washington University
How Plants Grow in Response to the Environment

Multiple Choice Quiz

Please answer all questions



1

Unlike tropisms, nastic movements are in response to
A)darkness
B)wind
C)non-directional stimuli
D)directional stimuli
2

Etiolated seedlings grow
A)toward red light
B)straighter than non-etiolated seedlings
C)toward far-red light
D)more slowly than non-etiolated seedlings
3

Brassinosteroids effect all of the things listed below except
A)bending stems
B)hastening senescence
C)membrane polarization
D)reproductive development
4

The pathway leading to flowering for plants that requires vernalization is the
A)seasonal pathway
B)light-dependent pathway
C)temperature-dependent pathway
D)autonomous pathway
5

Of the floral organ identifying genes, carpels are specified by
A)A only
B)A and B
C)B and C
D)C only
6

Roots grow downward as a weak _______________ response.
A)negative phototropic
B)positive phototropic
C)negative gravitropic
D)negative thigmotropic
E)positive thigmotropic
7

Cytokinin promotes the growth of
A)vascular cambium
B)shoots
C)lateral buds
D)roots
E)cork cambium
8

In short day plants, _______________, at least in part.
A)Pr suppresses flowering
B)Pfr stimulates flowering
C)Pr stimulates flowering
D)Pfr suppresses flowering
E)flowering is affected by far-red, not Pr or Pfr
9

__________________ is produced in large quantities in the climacteric phase of fruit ripening.
A)Auxin
B)Abscisic acid
C)Cytokinin
D)Ethylene
E)Gibberellin
10

Stems will form roots more readily if _______________ are attached than if they were removed.
A)other roots
B)flowers
C)leaves
D)branches
E)shoots
11

Short-day plants bloom in
A)spring and early summer
B)fall and winter
C)late summer and autumn
D)winter and spring
E)all summer long
12

Auxin is synthesized in plants from
A)adenine
B)proline
C)aspartane
D)phenylalanine
E)tryptophan
13

_______________ stimulates the production of hydrolytic enzymes.
A)Ethylene
B)Auxin
C)Gibberellins
D)Cytokinin
E)Indoleacetic acid
14

Environmental signals influence the distribution of an auxin in a plant by
A)decreasing the cell's sensitivity to the auxin
B)causing auxin to migrate to the lighted portion
C)destroying the auxin
D)causing auxin to migrate into the shaded portion
E)causing the plant to produce more auxin
15

________________ , in combination with auxin, stimulates cell division in plants and determines the course of differentiation.
A)Ethylene
B)Indoleacetic acid
C)Gibberellins
D)Abscisic acid
E)Cytokinin
16

Auxin increases the _______________ of cell walls.
A)plasticity
B)thickness
C)porosity
D)layers
E)rigidity
17

"Foolish seedling" disease in rice is caused by
A)auxins
B)gibberellins
C)cytokinins
D)ethylene
E)abscisic acid
18

In 1902, it was proposed that all living plant cells are
A)totipotent
B)undifferentiated
C)haploid
D)eukaryotic
E)diploid
19

In vascular plants, most cytokinins are produced in the
A)roots
B)shoots
C)flowers
D)leaves
E)lateral branches
20

Ripening of fruits, such as bananas, is hastened by
A)gibberellins
B)abiscisic acid
C)cytokinin
D)indoleacetic acid
E)ethylene
21

_______________ regulates stem elongation in young grass seedlings and most herbs.
A)abscisic acid
B)auxin
C)cytokinins
22

_______________ of plants are reversible and allow the plant to advantageously orient leaves.
A)Thigmotropisms
B)Turgor movements
C)Photoropisms
D)Gravitropisms
E)Abscisions
23

Light that passes through leaves of a tree inhibits seed germination because chlorophyll
A)absorbs red and far-red light
B)passes both red and far-red light
C)absorbs far-red light but passes red
D)passes only green light
E)absorbs red light, but passes far-red
24

One of the most important uses of auxins is the _______________ of abscission.
A)initiation
B)acceleration
C)stimulation
D)prevention
E)reinforcing
25

Which of the following plant hormones in incorrectly paired with its function?
A)auxins -- responsible for apical dominance
B)abscisic acid -- regulates the rate of transpiration
C)cytokinins -- delays senescence (aging and decay)
D)ethylene -- promotes ripening
E)gibberellins -- promotes bud and seed dormancy
26

Although abscisic acid in not involved in the formation of the abscission layer, it does have many roles in the life of plants. Which of the following is not a function of abscisic acid?
A)In times of water stress, it causes the stomata to close.
B)It promotes tolerance to stress.
C)It induces dormancy of buds.
D)It induces leaf and flower senescence.
E)It induces and maintains the dormancy of seeds.
27

Lateral stem development is controlled by the relative levels of:
A)cytokinins and auxins
B)abscisic acid and auxins
C)auxins and gibberellins
D)auxins and ethylene
E)cytokinins and ethylene
28

The hormone responsible for phototropic responses in the growing tips of plants is:
A)auxin
B)cytokinin
C)gibberellin
D)ethylene
E)abscisic acid
29

Tomatoes can be artificially ripened through the use of:
A)auxin
B)cytokinins
C)gibberellins
D)ethylene
E)abscisic acid
30

A hormone originating in the terminal bud of a plant suppresses the growth of lateral buds.
A)True
B)False
31

The response of a plant to touch is called thigmotropism.
A)True
B)False
32

Plant hormones can stimulate certain physiological processes while inhibiting others.
A)True
B)False
33

Phytochrome is the photoreceptor for phototropism.
A)True
B)False
34

In direct sunlight, most phytochrome is in the Pfr form.
A)True
B)False








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