Question 1

The photoreceptor that absorbs blue light and triggers a phototropic response is:

Accepted Answer

A)  phototropin. 
B)  phytochrome. 
C)  jasmonate. 
D)  systemin. 
E)  zeatin.

Question 2

Gibberellin-stimulated cell elongation occurs via cell wall acidification.
____________________

Accepted Answer

A) True 
 B)False

Question 3

The site of gravity reception in roots is the:

Accepted Answer

A)  root apical meristem. 
B)  periderm. 
C)  root epidermis. 
D)  root cap. 
E)  root hair.

Question 4

A seedling growing toward the source of light is an example of:

Accepted Answer

A)  shade avoidance. 
B)  a positive hypersensitive response. 
C)  a negative hypersensitive response. 
D)  a positive phototropic response. 
E)  a negative phototropic response.

Question 5

When a plant responds to external stimuli, such as light, gravity, or touch by directional growth, these responses are referred to as:

Accepted Answer

A)  turgor movements. 
B)  sleep movements. 
C)  nastic movements. 
D)  circadian rhythms. 
E)  tropisms.

Question 6

Examples of short-day plants are:

Accepted Answer

A)  poinsettia. 
B)  florist's chrysanthemum. 
C)  spinach. 
D)  black-eyed Susan. 
E)  both poinsettias and chrysanthemums.

Question 7

What hormone promotes apical dominance in plants?

Accepted Answer

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

Question 8

MATCHING
Match the plant hormone with its description.
a.abscisic acid
d.cytokinin
b.auxin
e.ethylene
c.brassinosteroid
f.gibberellin
-a steroid that binds to a receptor kinase in the plasma membrane

Accepted Answer

The answer of MATCHING
Match the plant hormone with its description.
a.abscisic...

Question 9

If you removed a coleoptile tip, placed it on an agar block for a period of time, and then placed the agar block to the side of the tip of a decapitated coleoptile, which of the following would happen next?

Accepted Answer

A)  The coleoptile would grow in a spiral pattern. 
B)  The coleoptile would die. 
C)  The coleoptile would not bend. 
D)  The coleoptile would bend away from the side having the agar block. 
E)  The coleoptile would bend toward the side having the agar block.

Question 10

MATCHING
Match the plant hormone with its description.
a.abscisic acid
d.cytokinin
b.auxin
e.ethylene
c.brassinosteroid
f.gibberellin
-stimulates stem elongation in dwarf varieties

Accepted Answer

The answer of MATCHING
Match the plant hormone with its description.
a.abscisic...

Question 11

The site of gravity perception in roots is the root apical meristem.
____________________

Accepted Answer

A) True 
 B)False

Question 12

In not more than three sentences, explain why a plant placed in a window grows toward the light.

Accepted Answer

The answer of In not more than three sentences, explain...

Question 13

A plant growth response to mechanical stress, such as rain and contact with passing animals, is known as:

Accepted Answer

A)  phototropism. 
B)  gravitropism. 
C)  thigmomorphogensis. 
D)  a circadian rhythm. 
E)  thigmotropism.

Question 14

Pr strongly absorbs light having a wavelength of 730 nm.

Accepted Answer

A) True 
 B)False

Question 15

If you placed a coleoptile in unidirectional light and then immediately covered the tip, which of the following would happen?

Accepted Answer

A)  The coleoptile would bend toward the light. 
B)  The coleoptile would not bend. 
C)  The coleoptile would bend away from the light. 
D)  The coleoptile would die. 
E)  The coleoptile would grow in a spiral pattern.

Question 16

The movement of auxin downward from its site of production is referred to as:

Accepted Answer

A)  gravitropism. 
B)  apical dominance. 
C)  nonpolar transport. 
D)  polar transport. 
E)  turgor movement.

Question 17

The most common and physiologically important auxin is:

Accepted Answer

A)  indoleacetic acid. 
B)  indolebutyric acid. 
C)  naphthaleneacetic acid. 
D)  2,4-D. 
E)  2,4,5-T.

Question 18

If you expose a plant to a light that shines on the right side of a plant, which of the following best describes why the plant grows toward the light?

Accepted Answer

A)  Light destroys auxin, and thus the shaded side grows faster. 
B)  Auxin moves from the shaded side to the lighted side where it stimulates growth. 
C)  Auxin moves from the lighted side to the shaded side where it stimulates growth. 
D)  Light destroys auxin and thus the lighted side grows faster. 
E)  Auxin moves from the shaded side to the lighted side where it inhibits growth.

Question 19

MATCHING
Match the plant hormone with its description.
a.abscisic acid
d.cytokinin
b.auxin
e.ethylene
c.brassinosteroid
f.gibberellin
-stimulates division of cells growth in tissue culture

Accepted Answer

The answer of MATCHING
Match the plant hormone with its description.
a.abscisic...

Question 20

MATCHING
Match the plant hormone with its description.
a.abscisic acid
d.cytokinin
b.auxin
e.ethylene
c.brassinosteroid
f.gibberellin
-triggers the synthesis of amylase in barley seeds

Accepted Answer

The answer of MATCHING
Match the plant hormone with its description.
a.abscisic...

Exam 38: Plant Developmental Responses to External and Internal Signals

The photoreceptor that absorbs blue light and triggers a phototropic response is:

Gibberellin-stimulated cell elongation occurs via cell wall acidification. ____________________

The site of gravity reception in roots is the:

A seedling growing toward the source of light is an example of:

When a plant responds to external stimuli, such as light, gravity, or touch by directional growth, these responses are referred to as:

Examples of short-day plants are:

What hormone promotes apical dominance in plants?

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -a steroid that binds to a receptor kinase in the plasma membrane

If you removed a coleoptile tip, placed it on an agar block for a period of time, and then placed the agar block to the side of the tip of a decapitated coleoptile, which of the following would happen next?

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -stimulates stem elongation in dwarf varieties

The site of gravity perception in roots is the root apical meristem. ____________________

In not more than three sentences, explain why a plant placed in a window grows toward the light.

A plant growth response to mechanical stress, such as rain and contact with passing animals, is known as:

Pr strongly absorbs light having a wavelength of 730 nm.

If you placed a coleoptile in unidirectional light and then immediately covered the tip, which of the following would happen?

The movement of auxin downward from its site of production is referred to as:

The most common and physiologically important auxin is:

If you expose a plant to a light that shines on the right side of a plant, which of the following best describes why the plant grows toward the light?

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -stimulates division of cells growth in tissue culture

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -triggers the synthesis of amylase in barley seeds