Question 1

Which hormone is involved in a plant dropping the lower leaves as it grows taller?

Accepted Answer

A)   Cytokinins
B)   Gibberellins
C)   Auxin
D)   Ethylene
E)   Abscisic acidF) B) and E)
G) All of the above

Question 2

Because tomatoes contain seeds they are classified as a(n)

Accepted Answer

A)   dry fruit.
B)   pome.
C)   stone fruit.
D)   berry.
E)   legume.F) A) and B)
G) D) and E)

Question 3

A friend complains that all of her house plants have bent stems.You examine the plants and find that their stems all curve toward the light.What would you recommend to your friend to correct the problem?

Accepted Answer

A)   Turn each plant occasionally towards the light.
B)   Apply an auxin to the shady side of the stems.
C)   Water the plants more frequently.
D)   Apply gibberellins to the bases of the stems.
E)   Repot the plants.F) D) and E)
G) A) and B)

Question 4

Which of the following is an incorrect match of structure to function?

Accepted Answer

A)   sepal - protection of flower
B)   filament - produces pollen
C)   petal - attracts pollinator
D)   ovary - contains female gametophyte
E)   stigma - allows pollen to adhereF) A) and B)
G) D) and E)

Question 5

During germination,which cellular structure will exhibit positive gravitrophism and grow downward?

Accepted Answer

A)   Embryonic root
B)   Embryonic shoot
C)   Cotyledon
D)   Shoot
E)   Seed nucleusF) C) and E)
G) A) and B)

Question 6

Ethylene stimulates fruit ripening by stimulating

Accepted Answer

A)   the transport of hydrogen ions out of the cell.
B)   the production of amylase for starch breakdown.
C)   bacterial activity which softens the fruit.
D)   cellulase to break down cellulose in cell walls.
E)   mitosis of cells within the fruit to promote fruit growth.F) A) and B)
G) A) and C)

Question 7

Phytochrome red (Pr) differs from phytochrome far-red (Pfr) in that

Accepted Answer

A)   Pr is converted to Pfr during the nighttime.
B)   Pr is converted to Pfr by absorbing sunlight.
C)   Pfr is converted to Pr by absorbing sunlight.
D)   Pfr is converted to Pr by absorbing far-red light that is available at dusk.
E)   Pr is converted to Pfr by absorbing far-red light, which is available only during full daylight.F) A) and C)
G) A) and E)

Question 8

Peaches may be ripened at home by enclosing them in a paper bag.This is due to the production of which hormone?

Accepted Answer

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

Question 9

What is the role of auxin in regards to plant growth?

Accepted Answer

A)   Auxin softens the cell wall enabling the cells to grow.
B)   Auxin disintegrates the cell wall in a plant allowing two cells to enlarge into one.
C)   Auxin will stunt plant growth.
D)   Auxin will increase the rate at which plant cells can grow.
E)   Auxin will decrease the rate at which plant cells grow.F) B) and C)
G) C) and D)

Question 10

Plants with both female and male flowers on the same plant are called

Accepted Answer

A)   complete.
B)   incomplete.
C)   monoecious.
D)   dioecious.
E)   bisexual.F) All of the above
G) A) and D)

Question 11

The microspores develop into microgametophytes in the

Accepted Answer

A)   anther.
B)   filament.
C)   stigma.
D)   style.
E)   ovary.F) B) and C)
G) B) and E)

Question 12

Plant hormones

Accepted Answer

A)   are receptor proteins.
B)   are chemical signaling molecules.
C)   are produced only in the apical meristem.
D)   are produced both in the apical meristem and the vascular cambium.
E)   are proteins.F) A) and C)
G) A) and D)

Question 13

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 breakdown 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) C) and D)
G) A) and B)

Question 14

Long day/short night plants bloom when the night length is greater than a critical length.

Accepted Answer

A) True 
 B)False

Question 15

If ethylene is applied to a bushel of apples,what is most likely to occur?

Accepted Answer

A)   The fruit will ripen.
B)   The apple seeds will go into a state of dormancy.
C)   The seeds will germinate.
D)   The fruit will retain its' water for a longer period of time.
E)   The apple stem will fall off.F) None of the above
G) A) and E)

Question 16

An advantage of using genetically modified plants is that they

Accepted Answer

A)   are genetically identical to the parent plant.
B)   grow much more quickly.
C)   may possess superior characteristics than the original plant.
D)   are always virus-free.
E)   cannot undergo asexual reproduction.F) A) and D)
G) B) and E)

Question 17

A root growing into the Earth is exhibiting negative gravitropism.

Accepted Answer

A) True 
 B)False

Question 18

Short day/long night plants

Accepted Answer

A)   bloom after a certain length of continuous daylight.
B)   bloom after a certain length of continuous darkness.
C)   bloom only at night.
D)   use other environmental stimuli to trigger flowering.
E)   bloom only during the day.F) A) and B)
G) A) and D)

Question 19

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 D)
G) A) and C)

Question 20

Plants undergo an alternation of generations.The _______ produces gametes that fuse to produce a new ______.

Accepted Answer

A)   sporophyte; gametophyte
B)   gametophyte; sporophyte
C)   gametophyte; flowers
D)   flowers; gametophyte
E)   sporophyte; flowersF) A) and E)
G) None of the above

Exam 21: Plant Responses and Reproduction

The microspores develop into microgametophytes in the

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Peaches may be ripened at home by enclosing them in a paper bag.This is due to the production of which hormone?

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Because tomatoes contain seeds they are classified as a(n)

Correct AnswerverifiedShow Answer

Plants undergo an alternation of generations.The _______ produces gametes that fuse to produce a new ______.

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

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A friend complains that all of her house plants have bent stems.You examine the plants and find that their stems all curve toward the light.What would you recommend to your friend to correct the problem?

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What is the role of auxin in regards to plant growth?

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Which hormone is involved in a plant dropping the lower leaves as it grows taller?

Correct AnswerverifiedShow Answer

If ethylene is applied to a bushel of apples,what is most likely to occur?

Correct AnswerverifiedShow Answer

Which of the following is an incorrect match of structure to function?

Correct AnswerverifiedShow Answer

Long day/short night plants bloom when the night length is greater than a critical length.

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During germination,which cellular structure will exhibit positive gravitrophism and grow downward?

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Ethylene stimulates fruit ripening by stimulating

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Plant hormones

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

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A root growing into the Earth is exhibiting negative gravitropism.

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Short day/long night plants

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Phytochrome red (Pr) differs from phytochrome far-red (Pfr) in that

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An advantage of using genetically modified plants is that they

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Plants with both female and male flowers on the same plant are called

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Plants undergo an alternation of generations.The _ produces gametes that fuse to produce a new .

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Phytochrome red (P_r) differs from phytochrome far-red (P_fr) in that

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