Question 1

The general sequence by which a plant responds to external stimuli is

Accepted Answer

A)   chloroplast-vascular bundle-sap.
B)   reception-transduction-cellular response.
C)   sensory nerve-interneuron-motor nerve.
D)   input-reflex-output.
E)   leaf-stem-root.F) C) and D)
G) B) and E)

Question 2

Auxin stimulates leaf release, while ethylene keeps leaves from falling.

Accepted Answer

A) True 
 B)False

Question 3

If you are trying to alter the defensive mechanisms of a plant, which component of the signal transduction pathway would be the ideal place to do this?

Accepted Answer

A)   Alter the receptor molecule on the plasma membrane, cytoplasm or nucleus.
B)   Block the relay proteins within the cytoplasm that will convert the signal.
C)   Change the gene expression or the cellular process that affects the plants growth.
D)   All of these would alter the defensive mechanisms of the plant.E) A) and B)
F) A) and C)

Question 4

Which plant hormone produced in apical meristems inhibits the growth of axillary buds?

Accepted Answer

A)   abscisic acid
B)   auxin
C)   cytokinin
D)   ethylene
E)   gibberellinF) C) and E)
G) A) and E)

Question 5

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)   AuxinE) B) and C)
F) C) and D)

Question 6

Which of the following plant hormones breaks dormancy in seeds and buds when applied to the plant?

Accepted Answer

A)   abscisic acid
B)   auxin
C)   cytokinin
D)   ethylene
E)   gibberellinsF) A) and B)
G) All of the above

Question 7

______ is often referred to as the "stress" hormone since it initiates and maintains seed and bud dormancy.

Accepted Answer

A)   Ethylene
B)   Cytokinins
C)   Abscisic acid
D)   GibberellinsE) All of the above
F) A) and B)

Question 8

Which statement about plant hormones is NOT true?

Accepted Answer

A)   Plant hormones include at least one form that is a gas.
B)   Each naturally occurring hormone has a specific chemical structure.
C)   Hormones are among the principal internal regulators of plant growth.
D)   Responses to plant hormones may be observed in nearly any part of a plant.
E)   All known growth regulators of plants are chemicals produced naturally in plants.F) A) and B)
G) A) and C)

Question 9

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)   IAAE) B) and D)
F) B) and C)

Question 10

Photoperiodism requires

Accepted Answer

A)   a biological clock which can measure time.
B)   a photoreceptor called phytochrome.
C)   increased turgor pressure.
D)   protease inhibitors.
E)   a biological clock which can measure time and a photoreceptor called phytochrome only are correct.F) C) and E)
G) A) and B)

Question 11

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)   gibberellinF) B) and E)
G) C) and D)

Question 12

Long-day plants will never flower if the day length is shorter than the critical period.

Accepted Answer

A) True 
 B)False

Question 13

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)   gibberellinF) C) and E)
G) C) and D)

Question 14

The vine in the picture below is displaying

Accepted Answer

A)   negative gravitropism.
B)   positive gravitropism.
C)   thigmotropism.
D)   negative phototropism.
E)   positive phototropism.F) D) and E)
G) A) and D)

Question 15

In order for signal transduction to work properly in plants the ______________________

Accepted Answer

A)   correct hormone needs to bind to the appropriate receptor in order to enter the cell.
B)   relay proteins need to amplify the signal and convert it into one that will alter the cellular machinery.
C)   gene expression must change to produce the appropriate cellular process.
D)   All of the answer choices are correct.E) C) and D)
F) B) and C)

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

Short-day plants flower when the day length is shorter than the critical length, but the required dark period is interrupted by a flash of light.

Accepted Answer

A) True 
 B)False

Question 18

Removing the top of a plant to create fuller growth involves which of the following hormones?

Accepted Answer

A)   auxins
B)   ethylene
C)   gibberellins
D)   cytokininsE) A) and B)
F) A) and C)

Question 19

Which of the following events will occur in response to gravitrophism?

Accepted Answer

A)   Because of the change in the plants position it will have sediments of statoliths (amyloplasts containing starch granules)  settle towards the lower side of the stems and roots and come into contact with the cytoskeletal elements.
B)   The stems on the shady side of the plant will elongate due to the presence of auxin.
C)   The tendril of the plant will coil around any type of substrate that it comes into contact with.
D)   The guard cells will swell with water due to an increase in sodium ions which will cause the plant to grow upright.E) B) and C)
F) B) and D)

Question 20

Which of the following ions is associated with auxin and used during signal transduction that causes a plant to bend towards a light sources?

Accepted Answer

A)   H+
B)   Ca2+
C)   Na+
D)   Mg2+E) A) and B)
F) B) and C)

Exam 26: Flowering Plants: Control of Growth Responses

Photoperiodism requires

Correct AnswerverifiedShow Answer

Which statement about plant hormones is NOT true?

Correct AnswerverifiedShow Answer

Which plant hormone produced in apical meristems inhibits the growth of axillary buds?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Short-day plants flower when the day length is shorter than the critical length, but the required dark period is interrupted by a flash of light.

Correct AnswerverifiedShow Answer

The vine in the picture below is displaying

Correct AnswerverifiedShow Answer

In order for signal transduction to work properly in plants the ______________________

Correct AnswerverifiedShow Answer

Which of the following ions is associated with auxin and used during signal transduction that causes a plant to bend towards a light sources?

Correct AnswerverifiedShow Answer

______ is often referred to as the "stress" hormone since it initiates and maintains seed and bud dormancy.

Correct AnswerverifiedShow Answer

Which of the following events will occur in response to gravitrophism?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Removing the top of a plant to create fuller growth involves which of the following hormones?

Correct AnswerverifiedShow Answer

Long-day plants will never flower if the day length is shorter than the critical period.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following plant hormones breaks dormancy in seeds and buds when applied to the plant?

Correct AnswerverifiedShow Answer

The general sequence by which a plant responds to external stimuli is

Correct AnswerverifiedShow Answer

If you are trying to alter the defensive mechanisms of a plant, which component of the signal transduction pathway would be the ideal place to do this?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Auxin stimulates leaf release, while ethylene keeps leaves from falling.

Correct AnswerverifiedShow Answer

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