Question 1

Bending of a plant toward light is called

Accepted Answer

A)  geotropism. 
B)  zeaxanthin. 
C)  phototropism. 
D)  absorption. 
E)  gravitropism. 
A)  geotropism. 
B)  zeaxanthin. 
C)  phototropism. 
D)  absorption. 
E)  gravitropism.

Question 2

Which of the following is the correct sequence of events that causes auxin to move in a polar direction in a plant stem?

Accepted Answer

A)  The ionized auxin is transported into the cell by efflux carriers, the auxin gains a proton in the basic cytosol, and the nonionized auxin passively diffuses out of the base of the cell. 
B)  Auxin picks up a proton in the basic cell wall space, the nonionized auxin passively diffuses across the cell membrane into the cell, the auxin loses a proton in the more acidic cytosol, the ionized auxin is transported out of the cell by an efflux carrier located only at the base of the cell, and the proton pumps in the cell membrane acidify the cell wall space. 
C)  Auxin passively diffuses into the cell as an anion, auxin stimulates proton pumps in the cell membrane to acidify the cytosol, the auxin picks up a proton to become uncharged, and the nonionized auxin is actively transported out of the cell by efflux carriers. 
D)  Proton pumps in the cell membrane acidify the cell wall space, auxin picks up a proton in the acidic cell wall space, the nonionized auxin passively diffuses across the cell membrane into the cell, the auxin loses a proton in the more basic cytosol, and the ionized auxin is transported out of the cell by an efflux carrier located only at the base of the cell. 
E)  Auxin moves down its concentration gradient from the tip of the plant where it is made to the base where it is used, passively entering and exiting each cell along the way. 
A)  The ionized auxin is transported into the cell by efflux carriers, the auxin gains a proton in the basic cytosol, and the nonionized auxin passively diffuses out of the base of the cell. 
B)  Auxin picks up a proton in the basic cell wall space, the nonionized auxin passively diffuses across the cell membrane into the cell, the auxin loses a proton in the more acidic cytosol, the ionized auxin is transported out of the cell by an efflux carrier located only at the base of the cell, and the proton pumps in the cell membrane acidify the cell wall space. 
C)  Auxin passively diffuses into the cell as an anion, auxin stimulates proton pumps in the cell membrane to acidify the cytosol, the auxin picks up a proton to become uncharged, and the nonionized auxin is actively transported out of the cell by efflux carriers. 
D)  Proton pumps in the cell membrane acidify the cell wall space, auxin picks up a proton in the acidic cell wall space, the nonionized auxin passively diffuses across the cell membrane into the cell, the auxin loses a proton in the more basic cytosol, and the ionized auxin is transported out of the cell by an efflux carrier located only at the base of the cell. 
E)  Auxin moves down its concentration gradient from the tip of the plant where it is made to the base where it is used, passively entering and exiting each cell along the way.

Question 3

As Charles Darwin and his son discovered, blocking light from the _______ of a young wheat plant would prevent phototropism from occurring.

Accepted Answer

The answer of As Charles Darwin and his son discovered,...

Question 4

A team of molecular biology researchers is trying to increase the value of agricultural seeds for livestock feed.To increase the store of metabolically useful energy in the seeds, the researchers should focus on increasing which of the following macromolecules?

Accepted Answer

A)  DNA and nucleic acids 
B)  Lipids and starches 
C)  Germination inhibitors 
D)  Proteins and amino acids 
E)  Cellulose and lignin 
A)  DNA and nucleic acids 
B)  Lipids and starches 
C)  Germination inhibitors 
D)  Proteins and amino acids 
E)  Cellulose and lignin

Question 5

Any molecule that is moved from one end of the plant to another, like auxin, is said to have _______ transport.

Accepted Answer

The answer of Any molecule that is moved from one...

Question 6

Which of the following represents the correct order of the stages of seed germination and subsequent events?

Accepted Answer

A)  Imbibition F1F1F1S1F1F1F10 RNA synthesis F1F1F1S1F1F1F10 cell division F1F1F1S1F1F1F10 starch degradation 
B)  Imbibition F1F1F1S1F1F1F10 starch degradation F1F1F1S1F1F1F10 cell division F1F1F1S1F1F1F10 RNA synthesis 
C)  Starch degradation F1F1F1S1F1F1F10 RNA synthesis F1F1F1S1F1F1F10 cell division F1F1F1S1F1F1F10 imbibition 
D)  Starch degradation F1F1F1S1F1F1F10 RNA synthesis F1F1F1S1F1F1F10 imbibition F1F1F1S1F1F1F10 cell division 
E)  Imbibition F1F1F1S1F1F1F10 RNA synthesis F1F1F1S1F1F1F10 starch degradation F1F1F1S1F1F1F10 cell division 
A)  Imbibition F1F1F1S1F1F1F10 RNA synthesis F1F1F1S1F1F1F10 cell division F1F1F1S1F1F1F10 starch degradation 
B)  Imbibition F1F1F1S1F1F1F10 starch degradation F1F1F1S1F1F1F10 cell division F1F1F1S1F1F1F10 RNA synthesis 
C)  Starch degradation F1F1F1S1F1F1F10 RNA synthesis F1F1F1S1F1F1F10 cell division F1F1F1S1F1F1F10 imbibition 
D)  Starch degradation F1F1F1S1F1F1F10 RNA synthesis F1F1F1S1F1F1F10 imbibition F1F1F1S1F1F1F10 cell division 
E)  Imbibition F1F1F1S1F1F1F10 RNA synthesis F1F1F1S1F1F1F10 starch degradation F1F1F1S1F1F1F10 cell division

Question 7

Whereas gibberellins promote seed germination, _______ promote(s) dormancy.

Accepted Answer

A)  auxin 
B)  cytokinins 
C)  abscisic acid 
D)  brassinosteroids 
E)  ethylene 
A)  auxin 
B)  cytokinins 
C)  abscisic acid 
D)  brassinosteroids 
E)  ethylene

Question 8

During an examination of a newly discovered species of grass that is bending toward light, you see that auxin in the coleoptile moves _______ the light, leading to _______ growth there.

Accepted Answer

A)  away from; less 
B)  away from; more 
C)  toward; less 
D)  toward; more 
E)  toward, then away from; spiral 
A)  away from; less 
B)  away from; more 
C)  toward; less 
D)  toward; more 
E)  toward, then away from; spiral

Question 9

Which of the following is not an effect of gibberellins in plant development?

Accepted Answer

A)  Promotion of fruit growth 
B)  Promotion of stem elongation 
C)  Mobilization of reserves in cereal grasses 
D)  Inducing dormancy 
E)  Promotion of seed germination 
A)  Promotion of fruit growth 
B)  Promotion of stem elongation 
C)  Mobilization of reserves in cereal grasses 
D)  Inducing dormancy 
E)  Promotion of seed germination

Question 10

The mechanism by which gibberellins act involves

Accepted Answer

A)  the adding of proton pumps to the plasma membrane. 
B)  the phosphorylation of proteins. 
C)  binding with a transcription factor. 
D)  the removal of a repressor from a transcription factor. 
E)  exposure to a gas. 
A)  the adding of proton pumps to the plasma membrane. 
B)  the phosphorylation of proteins. 
C)  binding with a transcription factor. 
D)  the removal of a repressor from a transcription factor. 
E)  exposure to a gas.

Question 11

The movement of auxin in plants is said to be "polar," which means that auxin

Accepted Answer

A)  is a chemically polar molecule. 
B)  is produced only in one part of the plant. 
C)  is primarily transported in only one direction in the plant. 
D)  moves in a direction away from the light. 
E)  cannot move through gelatin unless it is bound to a polar molecule. 
A)  is a chemically polar molecule. 
B)  is produced only in one part of the plant. 
C)  is primarily transported in only one direction in the plant. 
D)  moves in a direction away from the light. 
E)  cannot move through gelatin unless it is bound to a polar molecule.

Question 12

If a mutant plant were created that lacked the receptor for ethylene, its leaves would

Accepted Answer

A)  not expand as much as wild-type leaves. 
B)  be unable to turn green in the spring. 
C)  produce excess cytokinins to compensate for the missing ethylene response. 
D)  be unable to undergo abscission in the fall. 
E)  develop prematurely in the spring. 
A)  not expand as much as wild-type leaves. 
B)  be unable to turn green in the spring. 
C)  produce excess cytokinins to compensate for the missing ethylene response. 
D)  be unable to undergo abscission in the fall. 
E)  develop prematurely in the spring.

Question 13

Which group of plant hormones was discovered while solving a disease of rice called bakanae, or "foolish seedling disease," where plants grow overly tall and spindly?

Accepted Answer

A)  Auxin 
B)  Cytokinin 
C)  Gibberellins 
D)  Brassinosteroids 
E)  Ethylene 
A)  Auxin 
B)  Cytokinin 
C)  Gibberellins 
D)  Brassinosteroids 
E)  Ethylene

Question 14

Lettuce seeds exposed to (in sequence) red light, far-red light, red light, red light, far-red light, far-red light will

Accepted Answer

A)  germinate. 
B)  not germinate. 
C)  die. 
D)  dry out. 
E)  become quiescent. 
A)  germinate. 
B)  not germinate. 
C)  die. 
D)  dry out. 
E)  become quiescent.

Question 15

The "wall-loosening factor" present in the cell wall of plants is now believed to be

Accepted Answer

A)  auxins. 
B)  cellulose-digesting enzymes. 
C)  starch-digesting enzymes. 
D)  acid-activated expansins. 
E)  calcium ions. 
A)  auxins. 
B)  cellulose-digesting enzymes. 
C)  starch-digesting enzymes. 
D)  acid-activated expansins. 
E)  calcium ions.

Question 16

In promoting normal germination (and also in brewing, when production of sugars for alcoholic fermentation is desired), gibberellins

Accepted Answer

A)  absorb light. 
B)  cause stem elongation. 
C)  mobilize stored foods. 
D)  take up water. 
E)  direct the shoot upward. 
A)  absorb light. 
B)  cause stem elongation. 
C)  mobilize stored foods. 
D)  take up water. 
E)  direct the shoot upward.

Question 17

Gibberellins do not have a major effect on

Accepted Answer

A)  shoot growth. 
B)  fruit development. 
C)  seed germination. 
D)  root growth. 
E)  breaking winter dormancy. 
A)  shoot growth. 
B)  fruit development. 
C)  seed germination. 
D)  root growth. 
E)  breaking winter dormancy.

Question 18

Refer to the figure below.   Unlike the green tomatoes on the left, the red tomatoes on the right have probably been treated with the hormone

Accepted Answer

A)  gibberellin. 
B)  auxin. 
C)  brassinosteroid. 
D)  ethylene. 
E)  cytokinin. 
A)  gibberellin. 
B)  auxin. 
C)  brassinosteroid. 
D)  ethylene. 
E)  cytokinin.

Question 19

Growth in response to a gravitational field is known as

Accepted Answer

A)  phototropism. 
B)  positive thigmotropism. 
C)  negative thigmotropism. 
D)  gravitropism. 
E)  thermotropism. 
A)  phototropism. 
B)  positive thigmotropism. 
C)  negative thigmotropism. 
D)  gravitropism. 
E)  thermotropism.

Question 20

Which of the following does not increase during the initial stages of seed germination?

Accepted Answer

A)  Cell size 
B)  Respiration 
C)  RNA synthesis 
D)  Cell division rate 
E)  Protein synthesis 
A)  Cell size 
B)  Respiration 
C)  RNA synthesis 
D)  Cell division rate 
E)  Protein synthesis

Exam 36: Regulation of Plant Growth

Bending of a plant toward light is called

Which of the following is the correct sequence of events that causes auxin to move in a polar direction in a plant stem?

As Charles Darwin and his son discovered, blocking light from the _______ of a young wheat plant would prevent phototropism from occurring.

A team of molecular biology researchers is trying to increase the value of agricultural seeds for livestock feed.To increase the store of metabolically useful energy in the seeds, the researchers should focus on increasing which of the following macromolecules?

Any molecule that is moved from one end of the plant to another, like auxin, is said to have _______ transport.

Which of the following represents the correct order of the stages of seed germination and subsequent events?

Whereas gibberellins promote seed germination, _______ promote(s) dormancy.

During an examination of a newly discovered species of grass that is bending toward light, you see that auxin in the coleoptile moves _______ the light, leading to _______ growth there.

Which of the following is not an effect of gibberellins in plant development?

The mechanism by which gibberellins act involves

The movement of auxin in plants is said to be "polar," which means that auxin

If a mutant plant were created that lacked the receptor for ethylene, its leaves would

Which group of plant hormones was discovered while solving a disease of rice called bakanae, or "foolish seedling disease," where plants grow overly tall and spindly?

Lettuce seeds exposed to (in sequence) red light, far-red light, red light, red light, far-red light, far-red light will

The "wall-loosening factor" present in the cell wall of plants is now believed to be

In promoting normal germination (and also in brewing, when production of sugars for alcoholic fermentation is desired), gibberellins

Gibberellins do not have a major effect on

Refer to the figure below. Unlike the green tomatoes on the left, the red tomatoes on the right have probably been treated with the hormone

Growth in response to a gravitational field is known as

Which of the following does not increase during the initial stages of seed germination?

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During an examination of a newly discovered species of grass that is bending toward light, you see that auxin in the coleoptile moves _ the light, leading to _ growth there.