Question 1

Application of _______ to leaves can keep them green and delay senescence.

Accepted Answer

The answer of Application of _______ to leaves can keep...

Question 2

Phototropins are

Accepted Answer

A)  hormones. 
B)  hormone receptors. 
C)  light receptors for photomorphogenesis. 
D)  light receptors for phototropism. 
E)  closely related to phytochromes. 
A)  hormones. 
B)  hormone receptors. 
C)  light receptors for photomorphogenesis. 
D)  light receptors for phototropism. 
E)  closely related to phytochromes.

Question 3

Experimental removal of the auxin source demonstrates that leaf abscission is _______ by auxin and apical dominance is _______ by auxin.

Accepted Answer

A)  promoted; also promoted 
B)  inhibited; also inhibited 
C)  promoted; inhibited 
D)  inhibited; promoted 
E)  promoted; unaffected 
A)  promoted; also promoted 
B)  inhibited; also inhibited 
C)  promoted; inhibited 
D)  inhibited; promoted 
E)  promoted; unaffected

Question 4

Discuss how gibberellins were discovered. How did researchers determine that they are chemical in nature?

Accepted Answer

The first gibberellin was isolated from

Question 5

Production of auxin in response to light most likely involves

Accepted Answer

A)  phytochrome. 
B)  photoreceptors. 
C)  a mechanism that is currently unknown. 
D)  phototropin. 
E)  Both a and b 
A)  phytochrome. 
B)  photoreceptors. 
C)  a mechanism that is currently unknown. 
D)  phototropin. 
E)  Both a and b

Question 6

Spraying biennials such as cabbage with gibberellins causes them to bolt, a process first observed as an increase in

Accepted Answer

A)  leaf senescence. 
B)  stem elongation. 
C)  the number of flowers. 
D)  the size of fruit. 
E)  the number of seeds per fruit. 
A)  leaf senescence. 
B)  stem elongation. 
C)  the number of flowers. 
D)  the size of fruit. 
E)  the number of seeds per fruit.

Question 7

Cytokinins

Accepted Answer

A)  promote development of axillary buds. 
B)  are made primarily in the shoot apex. 
C)  inhibit cell division. 
D)  promote senescence. 
E)  are needed only in the early development of a plant. 
A)  promote development of axillary buds. 
B)  are made primarily in the shoot apex. 
C)  inhibit cell division. 
D)  promote senescence. 
E)  are needed only in the early development of a plant.

Question 8

Auxin transport within a plant is said to be _______ and it is dependent on the action of _______ pumps.

Accepted Answer

A)  polar; proton 
B)  nonpolar; potassium 
C)  polar; potassium 
D)  bidirectional; proton 
E)  polar; sodium 
A)  polar; proton 
B)  nonpolar; potassium 
C)  polar; potassium 
D)  bidirectional; proton 
E)  polar; sodium

Question 9

In coleoptile tissue, auxin

Accepted Answer

A)  is transported from base to tip. 
B)  is transported from tip to base. 
C)  can be transported toward either the tip or the base, depending on the orientation of the coleoptile with respect to gravity. 
D)  is transported by simple diffusion, with no preferred direction. 
E)  is not transported, because auxin is used where it is made. 
A)  is transported from base to tip. 
B)  is transported from tip to base. 
C)  can be transported toward either the tip or the base, depending on the orientation of the coleoptile with respect to gravity. 
D)  is transported by simple diffusion, with no preferred direction. 
E)  is not transported, because auxin is used where it is made.

Question 10

Use the following to answer questions :
Refer to the diagram below, showing seed germination.  
-Identify the molecules indicated by C in seed 2.

Accepted Answer

The answer of Use the following to answer questions :
Refer...

Question 11

Auxin transport goes

Accepted Answer

A)  from apex to base. 
B)  from base to apex. 
C)  either from apex to base or from base to apex. 
D)  primarily from apex to base, but sometimes in reverse. 
E)  primarily from base to apex, but sometimes in reverse. 
A)  from apex to base. 
B)  from base to apex. 
C)  either from apex to base or from base to apex. 
D)  primarily from apex to base, but sometimes in reverse. 
E)  primarily from base to apex, but sometimes in reverse.

Question 12

Use the following to answer questions:
Match the appropriate plant hormone from the list below with each description that follows. Each hormone may be used once, more than once, or not at all.
-A gas

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 13

Plant growth is regulated by

Accepted Answer

A)  environmental cues. 
B)  hormones. 
C)  signal transduction pathways. 
D)  the expression of the plant's genome. 
E)  All of the above 
A)  environmental cues. 
B)  hormones. 
C)  signal transduction pathways. 
D)  the expression of the plant's genome. 
E)  All of the above

Question 14

In the experiments of Charles and Francis Darwin, which parts of the seedlings were shown to be sensitive to light?

Accepted Answer

A)  The entire seedling 
B)  The entire shoot above the roots 
C)  The entire coleoptile 
D)  The coleoptile just below the tip 
E)  The extreme tip of the coleoptile 
A)  The entire seedling 
B)  The entire shoot above the roots 
C)  The entire coleoptile 
D)  The coleoptile just below the tip 
E)  The extreme tip of the coleoptile

Question 15

Which statement about cytokinins is not true?

Accepted Answer

A)  They promote cell division in tissue cultures. 
B)  They delay the senescence of leaves. 
C)  They usually promote the elongation of stems. 
D)  They act by a receptor with protein kinase activity. 
E)  They were discovered as a breakdown product of DNA. 
A)  They promote cell division in tissue cultures. 
B)  They delay the senescence of leaves. 
C)  They usually promote the elongation of stems. 
D)  They act by a receptor with protein kinase activity. 
E)  They were discovered as a breakdown product of DNA.

Question 16

Auxins and cytokinins appear to cancel out the effects of each other. Why is a hormone that affects bud growth produced in the roots while the one that affects root growth is produced in the shoots? How does this relate to the polar distribution of hormones?

Accepted Answer

Roots need shoots, and vice versa. Incre

Question 17

Fruit shippers apply _______ to speed up ripening.

Accepted Answer

The answer of Fruit shippers apply _______ to speed up...

Question 18

Leaf abscission is the

Accepted Answer

A)  separation of leaves from stems. 
B)  orientation of a leaf toward the light. 
C)  regeneration of a leaf after a wound. 
D)  maturation of leaf tissue. 
E)  initiation of new tissue growth. 
A)  separation of leaves from stems. 
B)  orientation of a leaf toward the light. 
C)  regeneration of a leaf after a wound. 
D)  maturation of leaf tissue. 
E)  initiation of new tissue growth.

Question 19

Use the following to answer questions :
Refer to the diagram below, showing an ethylene signal transduction pathway.  
-What type of molecule is C?

Accepted Answer

Membrane (

Question 20

Seed dormancy is usually an adaptation to ensure that

Accepted Answer

A)  the embryo is mature. 
B)  germination occurs at a favorable time. 
C)  seeds germinate near the parent plant. 
D)  levels of abscisic acid are high enough. 
E)  many seeds are ready to germinate. 
A)  the embryo is mature. 
B)  germination occurs at a favorable time. 
C)  seeds germinate near the parent plant. 
D)  levels of abscisic acid are high enough. 
E)  many seeds are ready to germinate.

Exam 37: Regulation of Plant Growth

Application of _______ to leaves can keep them green and delay senescence.

Phototropins are

Experimental removal of the auxin source demonstrates that leaf abscission is _______ by auxin and apical dominance is _______ by auxin.

Discuss how gibberellins were discovered. How did researchers determine that they are chemical in nature?

Production of auxin in response to light most likely involves

Spraying biennials such as cabbage with gibberellins causes them to bolt, a process first observed as an increase in

Cytokinins

Auxin transport within a plant is said to be _______ and it is dependent on the action of _______ pumps.

In coleoptile tissue, auxin

Use the following to answer questions : Refer to the diagram below, showing seed germination. -Identify the molecules indicated by C in seed 2.

Auxin transport goes

Use the following to answer questions: Match the appropriate plant hormone from the list below with each description that follows. Each hormone may be used once, more than once, or not at all. -A gas

Plant growth is regulated by

In the experiments of Charles and Francis Darwin, which parts of the seedlings were shown to be sensitive to light?

Which statement about cytokinins is not true?

Auxins and cytokinins appear to cancel out the effects of each other. Why is a hormone that affects bud growth produced in the roots while the one that affects root growth is produced in the shoots? How does this relate to the polar distribution of hormones?

Fruit shippers apply _______ to speed up ripening.

Leaf abscission is the

Use the following to answer questions : Refer to the diagram below, showing an ethylene signal transduction pathway. -What type of molecule is C?

Seed dormancy is usually an adaptation to ensure that

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Experimental removal of the auxin source demonstrates that leaf abscission is _ by auxin and apical dominance is _ by auxin.

Auxin transport within a plant is said to be _ and it is dependent on the action of _ pumps.