Question 1

Which of the following sequences correctly represents the phytochrome signal transduction pathway?

Accepted Answer

A)  Red light → PIF3 activation → PIF3 into nucleus → light-responsive gene switched off 
B)  Red light → Pfr to Pr → Pr into nucleus → Pr-PIF3 complex → light-responsive gene regulation 
C)  UV light → PIF3 into nucleus → light responsive gene produces phytochrome → Pr to Pfr 
D)  Blue light → Pfr into nucleus → Pfr-PIF3 complex → light-responsive gene regulation 
E)  Red light → Pr to Pfr → Pfr into nucleus → Pfr-PIF3 complex → light-responsive gene regulation 
A)  Red light → PIF3 activation → PIF3 into nucleus → light-responsive gene switched off 
B)  Red light → Pfr to Pr → Pr into nucleus → Pr-PIF3 complex → light-responsive gene regulation 
C)  UV light → PIF3 into nucleus → light responsive gene produces phytochrome → Pr to Pfr 
D)  Blue light → Pfr into nucleus → Pfr-PIF3 complex → light-responsive gene regulation 
E)  Red light → Pr to Pfr → Pfr into nucleus → Pfr-PIF3 complex → light-responsive gene regulation

Question 2

Match between columns
                        Premises: 2,4-D and 2,4,5-T

Accepted Answer

The Answer of Abscisic acid and Cytokinin and Auxin and is...

Question 3

Unripe green fruits ripen quickly in supermarkets or commercial storage facilities after exposure to

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 4

When a root is placed on its side, what happens to the amyloplasts in the root cap cells?

Accepted Answer

A)  They move away from the direction of gravity. 
B)  They settle in the direction of gravity. 
C)  They are digested by amylase. 
D)  They move into the root apical meristem. 
E)  They move into a root hair. 
A)  They move away from the direction of gravity. 
B)  They settle in the direction of gravity. 
C)  They are digested by amylase. 
D)  They move into the root apical meristem. 
E)  They move into a root hair.

Question 5

Summarize the hypersensitive response and system-acquired resistance, and explain how the two differ from each other.

Accepted Answer

Concepts to Consider: The hypersensitive

Question 6

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

Question 7

Auxin's most characteristic action is promotion of ______.

Accepted Answer

A)  fruit production 
B)  stem elongation 
C)  deed germination 
D)  abscission 
E)  cell division 
A)  fruit production 
B)  stem elongation 
C)  deed germination 
D)  abscission 
E)  cell division

Question 8

Biologists believe that a flower-producing substance called ____ is produced in the leaves and transported to the phloem.

Accepted Answer

A)  auxin 
B)  florigen 
C)  brassinosteroid 
D)  abscisic acid 
E)  ethylene 
A)  auxin 
B)  florigen 
C)  brassinosteroid 
D)  abscisic acid 
E)  ethylene

Question 9

Match between columns
                        Premises: Cocklebur

Accepted Answer

The Answer of Long-day plant and Intermediate-day plant and Short-day is...

Question 10

Which statement about the internal biological clock is false ?

Accepted Answer

A)  It is known as a circadian rhythm. 
B)  It relates to the opening and closing of stomata. 
C)  It includes the sleep movements observed in some plants, such as beans. 
D)  It may involve both phytochrome and cryptochrome. 
E)  It disappears totally if it is not reset by the rising and setting sun. 
A)  It is known as a circadian rhythm. 
B)  It relates to the opening and closing of stomata. 
C)  It includes the sleep movements observed in some plants, such as beans. 
D)  It may involve both phytochrome and cryptochrome. 
E)  It disappears totally if it is not reset by the rising and setting sun.

Question 11

You shine light at a wavelength of 660 nm on a plant. Which of the following will most likely happen next?

Accepted Answer

A)  Pfr is stored for later use. 
B)  Pr is synthesized. 
C)  Pr is converted to Pfr. 
D)  Pfr is converted to Pr. 
E)  Pr is degraded. 
A)  Pfr is stored for later use. 
B)  Pr is synthesized. 
C)  Pr is converted to Pfr. 
D)  Pfr is converted to Pr. 
E)  Pr is degraded.

Question 12

Match between columns
                        Premises: Involves ethylene

Accepted Answer

The Answer of Phototropism and Thigmotropism and Thigmomorphogenesis and Gravitropism is...

Question 13

Match between columns
                        Premises: Flowers when the night length is equal to or less than some critical period.

Accepted Answer

The Answer of Day-neutral plant and Intermediate-day plant and Long-day is...

Question 14

Match between columns
                        Premises: Exhibits polar transport

Accepted Answer

The Answer of Brassinosteroid and Abscisic acid and Gibberellin and is...

Question 15

You place a coleoptile in unidirectional light and then immediately cover the tip. Which of the following will happen?

Accepted Answer

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

Question 16

Brassinosteroids differ from other plant hormones in that they are

Accepted Answer

A)  peptides. 
B)  steroids. 
C)  derivatives of adenine. 
D)  derivatives of aspirin. 
E)  derivatives of prostaglandins. 
A)  peptides. 
B)  steroids. 
C)  derivatives of adenine. 
D)  derivatives of aspirin. 
E)  derivatives of prostaglandins.

Question 17

Match between columns
                        Premises: Inhibits the growth of axillary buds

Accepted Answer

The Answer of Brassinosteroid and Abscisic acid and Gibberellin and is...

Question 18

Which hormone promotes apical dominance in plants?

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 19

Match between columns
                        Premises: A steroid that binds to a receptor kinase in the plasma membrane

Accepted Answer

The Answer of Cytokinin and Gibberellin and Brassinosteroid and Abscisic is...

Question 20

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

Exam 38: Plant Developmental Responses to External and Internal Signals

Which of the following sequences correctly represents the phytochrome signal transduction pathway?

Unripe green fruits ripen quickly in supermarkets or commercial storage facilities after exposure to

When a root is placed on its side, what happens to the amyloplasts in the root cap cells?

Summarize the hypersensitive response and system-acquired resistance, and explain how the two differ from each other.

The most common and physiologically important auxin is

Auxin's most characteristic action is promotion of ______.

Biologists believe that a flower-producing substance called ____ is produced in the leaves and transported to the phloem.

Which statement about the internal biological clock is false ?

You shine light at a wavelength of 660 nm on a plant. Which of the following will most likely happen next?

You place a coleoptile in unidirectional light and then immediately cover the tip. Which of the following will happen?

Brassinosteroids differ from other plant hormones in that they are

Which hormone promotes apical dominance in plants?

The site of gravity reception in roots is the

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