Question 1

Flowering in most plants is triggered by

Accepted Answer

A)   auxin migration.
B)   night length.
C)   day length.
D)   gibberellin production.
E)   negative phototropism.F) All of the above
G) A) and D)

Question 2

A farmer wishes to force a normal plant to maintain a dwarf size. Which of the following plant hormones might she apply?

Accepted Answer

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

Question 3

In order for senescence to be prevented, which hormone needs to be present in the plant?

Accepted Answer

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

Question 4

In what way would a grower in the grape industry use gibberellins?

Accepted Answer

A)   Gibberellins would increase the size of the fruits.
B)   Gibberellins would prevent the plants from getting fungal infections.
C)   Gibberellins would help break down the starches found in the fruits, making them sweeter.
D)   Gibberellins would promote an increase in the rate at which the plants produce fruit.
E)   Gibberellins would make the plants resistant to parasitic infections.F) A) and B)
G) A) and C) A

Question 5

In a eudicot seed, the zygote becomes the _____, while the _____ is derived from the endosperm.

Accepted Answer

A)   embryo; seed coat
B)   cotyledons; embryo
C)   embryo; cotyledon
D)   embryo; stored food
E)   stored food; seed coatF) A) and D)
G) B) and E)

Question 6

Plant growth in response to an environmental stimulus is called

Accepted Answer

A)   apical dominance.
B)   a tropism.
C)   senescence.
D)   a photoperiod.
E)   dormancy.F) B) and C)
G) A) and E)

Question 7

What is the main advantage of using the meristem culture technique over natural methods of asexual reproduction?

Accepted Answer

A)   Meristem tissue can be disease-free.
B)   Meristem tissue is the most abundant tissue on the plant.
C)   This technique produces exact clones.
D)   Other culture techniques are not accepted by the public.
E)   This technique is relatively inexpensive to do.F) A) and B)
G) A) and C) A

Question 8

During germination, which part of the seed exhibits negative gravitrophism?

Accepted Answer

A)   embryonic shoot
B)   cotyledon
C)   seed coat
D)   root system
E)   embryoF) A) and B)
G) B) and E)

Question 9

Which cellular structure enables a root cell to grow downward?

Accepted Answer

A)   amyloplast
B)   chromoplast
C)   auxin
D)   chloroplast
E)   nucleusF) D) and E)
G) B) and E)

Question 10

Which of the following is not an effect of gibberellins?

Accepted Answer

A)   stem elongation between nodes
B)   cell elongation
C)   breaking of dormancy
D)   ripening of fruit
E)   excessive stem elongationF) A) and B)
G) D) and E)

Question 11

Which of the following events will occur if gibberellins are applied to barley?

Accepted Answer

A)   The lateral meristems will be inhibited and the plant will grow upward.
B)   The starchy endosperm will be broken down and converted into sugars for the developing embryo.
C)   The stomata will remain closed to avoid the loss of water from the plant.
D)   Plant growth is accelerated by promoting cell division.
E)   Cellulase is produced, which will stimulate the breakdown of the cellulose in the cell walls.F) B) and C)
G) A) and B)

Question 12

Some citizens are concerned about the use of genetically modified plants because they

Accepted Answer

A)   are better for the environment.
B)   may harm the environment.
C)   are less nutritious than the original plant.
D)   are genetically identical.
E)   do not grow as well as the original plant.F) B) and E)
G) A) and E)

Question 13

Since plant sperm are nonflagellated, how do they reach the ovule from the stigma?

Accepted Answer

A)   They swim in water.
B)   They are delivered by a pollen tube.
C)   They are carried on air currents.
D)   They are delivered by insects.
E)   The ovules are delivered to the stigma.F) A) and E)
G) C) and D)

Question 14

Which of the following plant hormones promotes cell division?

Accepted Answer

A)   cytokinins
B)   auxin
C)   gibberellins
D)   abscisic acid
E)   ethyleneF) All of the above
G) A) and B)

Question 15

An increase in the amount of protein produced is an advantage of using plants to develop products for the pharmaceutical industry.

Accepted Answer

A) True 
 B)False

Question 16

During pollen grain germination, the two cells will develop into the _____ and _____.

Accepted Answer

A)   pollen tube and sperm
B)   pollen tube and egg
C)   ovule and sperm
D)   fruit and seeds
E)   pollen tube and zygoteF) A) and E)
G) A) and D)

Question 17

You wish to change the growth pattern of the shrubs in your yard to give them a fuller, more bushy appearance. This could be accomplished by

Accepted Answer

A)   pruning the shoot tip.
B)   pruning the lateral buds.
C)   pruning the lateral buds and applying gibberellins.
D)   applying auxin to the roots.
E)   pruning the shoot tip and applying auxin to the shoot.F) B) and C)
G) A) and B)

Question 18

What is the actual site of double fertilization?

Accepted Answer

A)   ovule
B)   ovary
C)   embryo sac
D)   anther
E)   stigmaF) D) and E)
G) B) and E)

Question 19

The products of double fertilization in the _____ are a 2n ____ and a 3n _____.

Accepted Answer

A)   ovary; zygote; endosperm
B)   ovary; endosperm; zygote
C)   anther; zygote; endosperm
D)   anther; endosperm; zygote
E)   stigma; endosperm; zygoteF) All of the above
G) A) and D)

Question 20

Monocot seeds differ from eudicot seeds because in monocot seeds

Accepted Answer

A)   the cotyledons absorb the stored food of the endosperm.
B)   the endosperm is retained.
C)   there are two cotyledons instead of one.
D)   there is no seed coat.
E)   the endosperm develops into the embryo.F) A) and E)
G) A) and D)

Exam 21: Plant Responses and Reproduction

Flowering in most plants is triggered by

Correct AnswerverifiedShow Answer

A farmer wishes to force a normal plant to maintain a dwarf size. Which of the following plant hormones might she apply?

Correct AnswerverifiedShow Answer

In order for senescence to be prevented, which hormone needs to be present in the plant?

Correct AnswerverifiedB

In what way would a grower in the grape industry use gibberellins?

Correct AnswerverifiedA

In a eudicot seed, the zygote becomes the _____, while the _____ is derived from the endosperm.

Correct AnswerverifiedShow Answer

Plant growth in response to an environmental stimulus is called

Correct AnswerverifiedShow Answer

What is the main advantage of using the meristem culture technique over natural methods of asexual reproduction?

Correct AnswerverifiedA

During germination, which part of the seed exhibits negative gravitrophism?

Correct AnswerverifiedShow Answer

Which cellular structure enables a root cell to grow downward?

Correct AnswerverifiedShow Answer

Which of the following is not an effect of gibberellins?

Correct AnswerverifiedShow Answer

Which of the following events will occur if gibberellins are applied to barley?

Correct AnswerverifiedShow Answer

Some citizens are concerned about the use of genetically modified plants because they

Correct AnswerverifiedShow Answer

Since plant sperm are nonflagellated, how do they reach the ovule from the stigma?

Correct AnswerverifiedShow Answer

Which of the following plant hormones promotes cell division?

Correct AnswerverifiedShow Answer

An increase in the amount of protein produced is an advantage of using plants to develop products for the pharmaceutical industry.

Correct AnswerverifiedShow Answer

During pollen grain germination, the two cells will develop into the _____ and _____.

Correct AnswerverifiedShow Answer

You wish to change the growth pattern of the shrubs in your yard to give them a fuller, more bushy appearance. This could be accomplished by

Correct AnswerverifiedShow Answer

What is the actual site of double fertilization?

Correct AnswerverifiedShow Answer

The products of double fertilization in the _____ are a 2n ____ and a 3n _____.

Correct AnswerverifiedShow Answer

Monocot seeds differ from eudicot seeds because in monocot seeds

Correct AnswerverifiedShow Answer

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B

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A

In a eudicot seed, the zygote becomes the _, while the _ is derived from the endosperm.

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A

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During pollen grain germination, the two cells will develop into the _ and _.

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The products of double fertilization in the _ are a 2n and a 3n _.

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