Question 1

Rhythms that are repeated every 24 hours are

Accepted Answer

A)  sleep movements.
B)  tropisms.
C)  physiological requirements.
D)  circadian rhythms.
E)  biological clocks.F) A) and B)
G) A) and C)

Question 2

Plant growth and development is guided by

Accepted Answer

A)  hormones.
B)  other signaling molecules.
C)  water availability.
D)  day length.
E)  all of these.F) A) and B)
G) B) and E) E

Question 3

Use the above figure to answer questions 
 
-The letter "A" in the above figure represents

Accepted Answer

A)  the root nodules.
B)  the primary root.
C)  the primary leaf.
D)  the cotyledons.
E)  none of these.F) A) and B)
G) A) and C)

Question 4

Chemicals produced by one group of cells that affect other target cells are called

Accepted Answer

A)  secretions.
B)  signaling molecules.
C)  steroids.
D)  polymers.
E)  enzymes.F) B) and E)
G) D) and E)

Question 5

Auxin concentration gradients

Accepted Answer

A)  appear once germination begins.
B)  cause regional differences in gene transcription.
C)  allow formation of plant parts in expected patterns.
D)  help young cells elongate so that shoots and roots lengthen.
E)  are described by all EXCEPT "appear once germination begins."F) B) and E)
G) A) and E)

Question 6

Use the figure above to answer questions 
 
-The function of "A" is to

Accepted Answer

A)  digest the endosperm.
B)  protect new leaves as the seedling grows through soil.
C)  secrete hormones that cause flowering.
D)  absorb pheromones secreted by other seedlings.
E)  do none of these.F) All of the above
G) A) and B) B

Question 7

2,4-D, a potent eudicot weed killer, is most likely a synthetic

Accepted Answer

A)  auxin.
B)  gibberellin.
C)  cytokinin.
D)  phytochrome.
E)  none of these.F) D) and E)
G) None of the above

Question 8

Growth refers to an increase in the __________ of cells.

Accepted Answer

A)  size
B)  number
C)  differentiation
D)  volume
E)  all EXCEPT "differentiation"F) All of the above
G) A) and E)

Question 9

What hormone(s)  can be used commercially to prolong the shelf life of cut flowers?

Accepted Answer

A)  abscisic acid
B)  cytokinins
C)  auxins
D)  ABA
E)  ethyleneF) B) and E)
G) None of the above

Question 10

Use the above figure to answer questions 
 
-The letter "B" in the above figure represents

Accepted Answer

A)  the root nodules.
B)  the primary root.
C)  the primary leaf.
D)  the cotyledons.
E)  none of these.F) C) and E)
G) A) and D)

Question 11

The plant hormone that promotes cell division in roots and shoots is

Accepted Answer

A)  auxin.
B)  gibberellin.
C)  cytokinin.
D)  abscisic acid.
E)  ethylene.F) B) and C)
G) A) and D)

Question 12

All EXCEPT which of the following has an effect on seed germination?

Accepted Answer

A)  moisture
B)  temperature
C)  carbon dioxide
D)  number of daylight hours
E)  oxygenF) B) and D)
G) A) and E)

Question 13

Which factor has NOT been implicated in breaking dormancy?

Accepted Answer

A)  cytokinin movement from leaves to buds in late summer
B)  action of abscisic acid in the spring
C)  gibberellin accumulation in buds in late autumn and winter
D)  an exposure to low temperatures for hundreds of hours
E)  all of theseF) B) and E)
G) B) and C)

Question 14

Use the above figure to answer questions 
 
-The letter "C" in the above figure represents

Accepted Answer

A)  the root nodules.
B)  the primary root.
C)  the primary leaf.
D)  the cotyledons.
E)  none of these.F) A) and B)
G) B) and D)

Question 15

Which of the following is false regarding plant hormones?

Accepted Answer

A)  They are signaling molecules that travel to target cells.
B)  They stimulate or inhibit gene activity.
C)  They bind to receptors on their target cells.
D)  Target cells are always adjacent to the secreting cell.
E)  All of these are false.F) A) and B)
G) A) and C) D

Question 16

The aging of a plant is

Accepted Answer

A)  senescence.
B)  vernalization.
C)  abscission.
D)  dormancy.
E)  chlorosis.F) C) and D)
G) A) and B)

Question 17

Use the above figure to answer questions 
 
-The letter "D" in the above figure represents

Accepted Answer

A)  the root nodules.
B)  the primary root.
C)  the primary leaf.
D)  the cotyledons.
E)  none of these.F) None of the above
G) D) and E)

Question 18

Compared with young trees growing out in the open, young trees growing in a darker forest understory tend to have longer, thinner trunks with less branching.This developmental pattern is principally caused by

Accepted Answer

A)  phototropism.
B)  thigmotropism.
C)  activated phytochrome being converted to inactive phytochrome.
D)  inactive phytochrome being converted to active phytochrome.
E)  none of these.F) A) and E)
G) A) and D)

Question 19

The plant movement in the above figure is caused by

Accepted Answer

A)  auxin differences in two sides of the coleoptile.
B)  gibberellin released in one side of the leaf.
C)  abscisic acid in two sides of the stems.
D)  salicylic acid in two sides of the roots.
E)  none of these.F) A) and E)
G) C) and D)

Question 20

The primary root of a seedling grows down

Accepted Answer

A)  to avoid light.
B)  in response to gravity.
C)  because the cells on the upper surface of the root elongate more rapidly than those on the lower surface of the root.
D)  in response to different concentrations of auxin.
E)  because of all of these except "to avoid light."F) C) and E)
G) None of the above

Exam 31: Plant Growth and Development

Rhythms that are repeated every 24 hours are

Correct AnswerverifiedShow Answer

Plant growth and development is guided by

Correct AnswerverifiedE

Use the above figure to answer questions -The letter "A" in the above figure represents

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Chemicals produced by one group of cells that affect other target cells are called

Correct AnswerverifiedShow Answer

Auxin concentration gradients

Correct AnswerverifiedShow Answer

Use the figure above to answer questions -The function of "A" is to

Correct AnswerverifiedB

2,4-D, a potent eudicot weed killer, is most likely a synthetic

Correct AnswerverifiedShow Answer

Growth refers to an increase in the __________ of cells.

Correct AnswerverifiedShow Answer

What hormone(s) can be used commercially to prolong the shelf life of cut flowers?

Correct AnswerverifiedShow Answer

Use the above figure to answer questions -The letter "B" in the above figure represents

Correct AnswerverifiedShow Answer

The plant hormone that promotes cell division in roots and shoots is

Correct AnswerverifiedShow Answer

All EXCEPT which of the following has an effect on seed germination?

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Which factor has NOT been implicated in breaking dormancy?

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Use the above figure to answer questions -The letter "C" in the above figure represents

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Which of the following is false regarding plant hormones?

Correct AnswerverifiedD

The aging of a plant is

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Use the above figure to answer questions -The letter "D" in the above figure represents

Correct AnswerverifiedShow Answer

Compared with young trees growing out in the open, young trees growing in a darker forest understory tend to have longer, thinner trunks with less branching.This developmental pattern is principally caused by

Correct AnswerverifiedShow Answer

The plant movement in the above figure is caused by

Correct AnswerverifiedShow Answer

The primary root of a seedling grows down

Correct AnswerverifiedShow Answer

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E

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B

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D

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