Question 1

Which of the following plant hormones prevents plant tissues from senescing,or aging?

Accepted Answer

A) abscisic acid 
B) auxin 
C) cytokinin 
D) ethylene 
E) gibberellin 
A) abscisic acid 
B) auxin 
C) cytokinin 
D) ethylene 
E) gibberellin

Question 2

Horticulturists often use ______ and other growth regulators applied as a paste to plant cuttings to stimulate root formation.

Accepted Answer

A) ethylene 
B) abscisic acid 
C) cytokinins 
D) indolacetic acid (IA
A)  
A) ethylene 
B) abscisic acid 
C) cytokinins 
D) indolacetic acid (IA
A)

Question 3

How does gibberellin actually work?

Accepted Answer

A) In the presence of blue light,it triggers additional photosynthesis and growth. 
B) It attaches to a plasma membrane receptor and results in gene activation to produce the enzyme amylase that releases sugars for additional cell growth,division,and elongation. 
C) In the presence of light,it increases the formation of additional DNA that codes for additional plant structures. 
D) In the presence of unidirectional light,it moves to the shady side and activates an ATP-driven proton pump that results in weakened cell walls and eventual elongation. 
E) In the presence of light,it increases the turgor pressure of the cell and accelerates growth. 
A) In the presence of blue light,it triggers additional photosynthesis and growth. 
B) It attaches to a plasma membrane receptor and results in gene activation to produce the enzyme amylase that releases sugars for additional cell growth,division,and elongation. 
C) In the presence of light,it increases the formation of additional DNA that codes for additional plant structures. 
D) In the presence of unidirectional light,it moves to the shady side and activates an ATP-driven proton pump that results in weakened cell walls and eventual elongation. 
E) In the presence of light,it increases the turgor pressure of the cell and accelerates growth.

Question 4

Which of the following pertain to movement of plants?

Accepted Answer

A) nastic movements 
B) thigmotropism 
C) phototropism 
D) gravitropism 
E) All of the choices are correct. 
A) nastic movements 
B) thigmotropism 
C) phototropism 
D) gravitropism 
E) All of the choices are correct.

Question 5

Indoleacetic acid (IAA)is the most commonly occurring form of which of the following plant hormones?

Accepted Answer

A) abscisic acid 
B) ethylene 
C) cytokinin 
D) auxin 
E) gibberellin 
A) abscisic acid 
B) ethylene 
C) cytokinin 
D) auxin 
E) gibberellin

Question 6

How does auxin actually cause stems to curve towards the light?

Accepted Answer

A) In the presence of blue light,auxin triggers additional photosynthesis and growth. 
B) In the presence of light,auxin increases the turgor pressure of the cell and accelerates growth. 
C) In the presence of light,auxin increases the formation of hydrolytic enzymes that release energy needed for growth purposes. 
D) In the presence of light,auxin moves toward the light source and activates a protein that binds to DNA and starts enzyme production. 
E) In the presence of unidirectional light,auxin moves to the shady side and activates an ATP-driven proton pump that results in weakened cell walls and eventual elongation. 
A) In the presence of blue light,auxin triggers additional photosynthesis and growth. 
B) In the presence of light,auxin increases the turgor pressure of the cell and accelerates growth. 
C) In the presence of light,auxin increases the formation of hydrolytic enzymes that release energy needed for growth purposes. 
D) In the presence of light,auxin moves toward the light source and activates a protein that binds to DNA and starts enzyme production. 
E) In the presence of unidirectional light,auxin moves to the shady side and activates an ATP-driven proton pump that results in weakened cell walls and eventual elongation.

Question 7

A chemical messenger from the embryo that stimulates a seed to digest the endosperm is

Accepted Answer

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

Question 8

Long-day plants flower when the day length is longer than the critical period.

Accepted Answer

A) True 
 B)False

Question 9

If a plant is placed on its side,cells on the lower side of the stem will respond to gravity and elongate,making the stem turn so that it continues to grow downward.

Accepted Answer

A) True 
 B)False

Question 10

Mutualism is a beneficial relationship between a plant and animal species.It can lead to the death of the plant species if the animal species is removed from the environment.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following plant hormones is used to prolong the life of flower cuttings and stored vegetables?

Accepted Answer

A) auxins 
B) cytokinins 
C) ethylene 
D) IAA 
A) auxins 
B) cytokinins 
C) ethylene 
D) IAA

Question 12

Thigmomorphogenesis is a touch response where the whole plant responds to an environmental stimulus.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following plant hormones was discovered in infected rice seedlings that grew extremely tall and slender with "foolish seedling disease"?

Accepted Answer

A) abscisic acid 
B) auxin 
C) cytokinin 
D) ethylene 
E) gibberellins 
A) abscisic acid 
B) auxin 
C) cytokinin 
D) ethylene 
E) gibberellins

Question 14

Which statement is NOT true about photoperiodism?

Accepted Answer

A) A short-day plant flowers when the day length is shorter than a critical length. 
B) A day-neutral plant flowers according to some form of regulation other than photoperiodism. 
C) A long-day plant will flower when the day length is longer than a critical length. 
D) The phytochrome form Pfr is converted to Pr in daylight,producing the active form that induces flowering in long-day plants. 
A) A short-day plant flowers when the day length is shorter than a critical length. 
B) A day-neutral plant flowers according to some form of regulation other than photoperiodism. 
C) A long-day plant will flower when the day length is longer than a critical length. 
D) The phytochrome form Pfr is converted to Pr in daylight,producing the active form that induces flowering in long-day plants.

Exam 26: Flowering Plants: Control of Growth Responses

Which of the following plant hormones prevents plant tissues from senescing,or aging?

Horticulturists often use ______ and other growth regulators applied as a paste to plant cuttings to stimulate root formation.

How does gibberellin actually work?

Which of the following pertain to movement of plants?

Indoleacetic acid (IAA)is the most commonly occurring form of which of the following plant hormones?

How does auxin actually cause stems to curve towards the light?

A chemical messenger from the embryo that stimulates a seed to digest the endosperm is

Long-day plants flower when the day length is longer than the critical period.

If a plant is placed on its side,cells on the lower side of the stem will respond to gravity and elongate,making the stem turn so that it continues to grow downward.

Mutualism is a beneficial relationship between a plant and animal species.It can lead to the death of the plant species if the animal species is removed from the environment.

Which of the following plant hormones is used to prolong the life of flower cuttings and stored vegetables?

Thigmomorphogenesis is a touch response where the whole plant responds to an environmental stimulus.

Which of the following plant hormones was discovered in infected rice seedlings that grew extremely tall and slender with "foolish seedling disease"?

Which statement is NOT true about photoperiodism?

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