Question 1

Differentiate between circadian rhythms and photoperiodism. Give examples of each. What regulates these responses?

Accepted Answer

Concepts to Consider: Photoperiodism is ...

Question 2

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 3

Cryptochrome absorbs blue light.

Accepted Answer

A) True 
 B)False

Question 4

Auxin sprayed on tomato flowers stimulates the ____ to develop without the formation of ____.

Accepted Answer

A)   roots; root hairs
B)   fruit; ovaries
C)   seeds; ovaries
D)   ovary; seeds
E)   seeds; fruits

Question 5

In barley seed germination, the ____ releases gibberellin, which triggers the synthesis of ____ in the ____.

Accepted Answer

A)   seed coat; α -amylase; embryo
B)   endosperm; cellulase; embryo
C)   embryo; α -amylase; endosperm
D)   embryo; cellulase; seed coat
E)   endosperm; β -amylase; embryo

Question 6

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.

Question 7

Which statement concerning phytochrome-induced responses is false ?

Accepted Answer

A)   All responses are very rapid and short-term.
B)   Red light causes potassium channels to open.
C)   The absorption of light by one part of the phytochrome molecule triggers a conformational change in another part.
D)   Phytochrome activates transcription of the gene for a subunit of rubisco.
E)   Far-red light causes potassium channels to close.

Question 8

Which hormone promotes stem elongation and was first discovered while studying the growth of extremely tall and spindly rice plants?

Accepted Answer

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

Question 9

Match between columns
                        Premises: Coleus
flowering does not respond to light length
Arabidoposis
Cocklebur
flowers when the night length is equal to or greater than some critical period
flowers when the night length is equal to or less than some critical period.
does not flower when night length is too long or too short
Cucumber

Accepted Answer

The Answer of day neutral plant and short day plant is...

Question 10

Which statement concerning the auxin F-box protein is false ?

Accepted Answer

A)   It is located in the nucleus.
B)   It is a type of receptor.
C)   It is involved in catalyzing the addition of ubiquitin tags.
D)   Plants have about 700 of these.
E)   An example is the transport inhibitor response 1 protein.

Question 11

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 12

Write a one-sentence explanation for the role of each of the following plant hormonelike signaling molecules: methyl salicylate and jasmonic acid.

Accepted Answer

Methyl salicylate triggers a signal tran...

Question 13

When cytokinins are sprayed on leaves of a cut stem, the leaves become, or remain, yellow .

Accepted Answer

A) True 
 B)False

Question 14

Which hormone promotes cell elongation by changing plant cell walls so they can expand due to the force of turgor pressure?

Accepted Answer

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

Question 15

What hypothetical hormone promotes flowering but has never been successfully isolated?

Accepted Answer

A)   florigen
B)   ubiquitin
C)   jasmonic acid
D)   brassinosteroids
E)   methyl salicylate

Question 16

The twining of tendrils around a support is an example of thigmomorphogenesis .

Accepted Answer

A) True 
 B)False

Question 17

An example of a long-day plant is:

Accepted Answer

A)   poinsettia.
B)   florist's chrysanthemum.
C)   sunflower.
D)   black-eyed Susan.
E)   sugarcane.

Question 18

Changing day length, as well as variations in precipitation and temperature, are environmental cues that exert an important influence on:

Accepted Answer

A)   the kinds of genes a plant has.
B)   the number of mutations that genes undergo.
C)   whether a plant is an annual, biennial, or perennial.
D)   which genes will be expressed in a plant.
E)   whether a plant reproduces sexually or asexually.

Question 19

____ is a synthetic auxin that stimulates root development on stem cuttings and is used extensively in asexual propagation.

Accepted Answer

A)   Indoleacetic acid
B)   Indolebutyric acid
C)   Naphthalene acetic acid
D)   2,4-D
E)   2,4,5-T

Question 20

The effect of red light on plants is to:

Accepted Answer

A)   inactivate phytochrome.
B)   convert Pfr to Pr.
C)   inhibit germination in some seeds.
D)   initiate shade avoidance responses.
E)   impact the equilibrium between Pr and Pfr.

Exam 38: Plant Developmental Responses to External and Internal Signals

The effect of red light on plants is to:

Correct Answer
verified

Brassinosteroids differ from other plant hormones in that they are:

Correct Answer
verified

The twining of tendrils around a support is an example of thigmomorphogenesis .

Correct Answer
verified

Match the plant type with its description or example.

Which statement concerning phytochrome-induced responses is false ?

Correct Answer
verified

Write a one-sentence explanation for the role of each of the following plant hormonelike signaling molecules: methyl salicylate and jasmonic acid.

Correct Answer
verified
Methyl salicylate triggers a signal tran...
View Answer

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

Correct Answer
verified

____ is a synthetic auxin that stimulates root development on stem cuttings and is used extensively in asexual propagation.

Correct Answer
verified

What hypothetical hormone promotes flowering but has never been successfully isolated?

Correct Answer
verified

Cryptochrome absorbs blue light.

Correct Answer
verified

Which hormone promotes stem elongation and was first discovered while studying the growth of extremely tall and spindly rice plants?

Correct Answer
verified

In barley seed germination, the releases gibberellin, which triggers the synthesis of in the .

Correct Answer
verified

An example of a long-day plant is:

Correct Answer
verified

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

Correct Answer
verified

Changing day length, as well as variations in precipitation and temperature, are environmental cues that exert an important influence on:

Correct Answer
verified

Which hormone promotes cell elongation by changing plant cell walls so they can expand due to the force of turgor pressure?

Correct Answer
verified

Differentiate between circadian rhythms and photoperiodism. Give examples of each. What regulates these responses?

Correct Answer
verified
Concepts to Consider: Photoperiodism is ...
View Answer

When cytokinins are sprayed on leaves of a cut stem, the leaves become, or remain, yellow .

Correct Answer
verified

Which statement concerning the auxin F-box protein is false ?

Correct Answer
verified

Auxin sprayed on tomato flowers stimulates the to develop without the formation of .

Correct Answer
verified

Exam 38: Plant Developmental Responses to External and Internal Signals

The effect of red light on plants is to:

Correct AnswerverifiedShow Answer

Brassinosteroids differ from other plant hormones in that they are:

Correct AnswerverifiedShow Answer

The twining of tendrils around a support is an example of thigmomorphogenesis .

Correct AnswerverifiedShow Answer

Match the plant type with its description or example.

Which statement concerning phytochrome-induced responses is false ?

Correct AnswerverifiedShow Answer

Write a one-sentence explanation for the role of each of the following plant hormonelike signaling molecules: methyl salicylate and jasmonic acid.

Correct AnswerverifiedMethyl salicylate triggers a signal tran...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

____ is a synthetic auxin that stimulates root development on stem cuttings and is used extensively in asexual propagation.

Correct AnswerverifiedShow Answer

What hypothetical hormone promotes flowering but has never been successfully isolated?

Correct AnswerverifiedShow Answer

Cryptochrome absorbs blue light.

Correct AnswerverifiedShow Answer

Which hormone promotes stem elongation and was first discovered while studying the growth of extremely tall and spindly rice plants?

Correct AnswerverifiedShow Answer

In barley seed germination, the ____ releases gibberellin, which triggers the synthesis of ____ in the ____.

Correct AnswerverifiedShow Answer

An example of a long-day plant is:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Changing day length, as well as variations in precipitation and temperature, are environmental cues that exert an important influence on:

Correct AnswerverifiedShow Answer

Which hormone promotes cell elongation by changing plant cell walls so they can expand due to the force of turgor pressure?

Correct AnswerverifiedShow Answer

Differentiate between circadian rhythms and photoperiodism. Give examples of each. What regulates these responses?

Correct AnswerverifiedConcepts to Consider: Photoperiodism is ...View AnswerShow Answer

When cytokinins are sprayed on leaves of a cut stem, the leaves become, or remain, yellow .

Correct AnswerverifiedShow Answer

Which statement concerning the auxin F-box protein is false ?

Correct AnswerverifiedShow Answer

Auxin sprayed on tomato flowers stimulates the ____ to develop without the formation of ____.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Methyl salicylate triggers a signal tran...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In barley seed germination, the releases gibberellin, which triggers the synthesis of in the .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Concepts to Consider: Photoperiodism is ...
View Answer

Correct Answer
verified

Correct Answer
verified

Auxin sprayed on tomato flowers stimulates the to develop without the formation of .

Correct Answer
verified