Question 1

Which of the following hormones would you supply to a dwarf plant to increase its height?

Accepted Answer

A)  Cytokinin 
B)  Auxin 
C)  Gibberellin 
D)  Abscisic acid 
E)  Ethylene 
A)  Cytokinin 
B)  Auxin 
C)  Gibberellin 
D)  Abscisic acid 
E)  Ethylene

Question 2

Use the following to answer questions :
Refer to the diagram below, showing seed germination.  
-Identify the structures A and B in seed 1.

Accepted Answer

(A) aleuro

Question 3

A germinating grass seedling embryo produces _______, which mobilize stored nutrients.

Accepted Answer

The answer of A germinating grass seedling embryo produces _______,...

Question 4

Before seed germination can begin,

Accepted Answer

A)  seed dormancy must be broken. 
B)  the radicle must emerge from the seed. 
C)  water must be excluded. 
D)  oxygen must be excluded. 
E)  cell division must increase greatly. 
A)  seed dormancy must be broken. 
B)  the radicle must emerge from the seed. 
C)  water must be excluded. 
D)  oxygen must be excluded. 
E)  cell division must increase greatly.

Question 5

Use the following to answer questions :
Refer to the diagram below, showing an ethylene signal transduction pathway.  
-At the final outcome of the pathway, are genes turned "on" or "off"?

Accepted Answer

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

Question 6

Use the following to answer questions :
Refer to the diagram below, showing an ethylene signal transduction pathway.  
-Which membranes are indicated by labels E and F?

Accepted Answer

(E) endoplasmic reti

Question 7

Phytochromes

Accepted Answer

A)  mediate the effects of blue light on plant development. 
B)  have little effect on plant growth and development. 
C)  can absorb either red or far-red light. 
D)  are active in the Pr form. 
E)  are the photoreceptors for phototropism. 
A)  mediate the effects of blue light on plant development. 
B)  have little effect on plant growth and development. 
C)  can absorb either red or far-red light. 
D)  are active in the Pr form. 
E)  are the photoreceptors for phototropism.

Question 8

Red light activation of the phytochorome into the Pfr state leads to which of the following events?

Accepted Answer

A)  Inhibition of chlorophyll 
B)  Leaf expansion 
C)  Hook folding 
D)  Hook unfolding 
E)  Both b and d 
A)  Inhibition of chlorophyll 
B)  Leaf expansion 
C)  Hook folding 
D)  Hook unfolding 
E)  Both b and d

Question 9

The effect of light on the growth and development of a plant is called

Accepted Answer

A)  photosynthesis. 
B)  photophosphorylation. 
C)  phototropism. 
D)  photomorphogenesis. 
E)  photoinhibition. 
A)  photosynthesis. 
B)  photophosphorylation. 
C)  phototropism. 
D)  photomorphogenesis. 
E)  photoinhibition.

Question 10

Treatment of some plants with gibberellins or auxin causes parthenocarpy, which is the

Accepted Answer

A)  formation of flowers with petals in multiples of four. 
B)  division of one shoot into two separate shoots. 
C)  formation of fruit with only one seed instead of many. 
D)  formation of fruit without fertilization. 
E)  formation of an embryo without fertilization. 
A)  formation of flowers with petals in multiples of four. 
B)  division of one shoot into two separate shoots. 
C)  formation of fruit with only one seed instead of many. 
D)  formation of fruit without fertilization. 
E)  formation of an embryo without fertilization.

Question 11

In their experiment with grass coleoptiles, Charles and Francis Darwin observed that the photoreceptor was _______ and the bending took place _______.

Accepted Answer

A)  in the tip; also at the tip 
B)  below the tip; also below the tip 
C)  in the tip; below the tip 
D)  below the tip; throughout the coleoptile 
E)  in the tip; throughout the coleoptile 
A)  in the tip; also at the tip 
B)  below the tip; also below the tip 
C)  in the tip; below the tip 
D)  below the tip; throughout the coleoptile 
E)  in the tip; throughout the coleoptile

Question 12

Phototropin is classified as a(n)

Accepted Answer

A)  phytochrome. 
B)  blue-light receptor. 
C)  gibberellin. 
D)  cytokinin. 
E)  abscisic acid. 
A)  phytochrome. 
B)  blue-light receptor. 
C)  gibberellin. 
D)  cytokinin. 
E)  abscisic acid.

Question 13

Which of the following does not occur in seed germination?

Accepted Answer

A)  Imbibition of water 
B)  Metabolic changes 
C)  Growth of the radicle 
D)  Mobilization of nutrient reserves 
E)  Extensive mitotic divisions 
A)  Imbibition of water 
B)  Metabolic changes 
C)  Growth of the radicle 
D)  Mobilization of nutrient reserves 
E)  Extensive mitotic divisions

Question 14

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

Accepted Answer

Transcript

Question 15

Two different hormones have opposing effects on senescence: _______ promotes it, whereas _______ inhibits it.

Accepted Answer

A)  auxin; cytokinin 
B)  ethylene; cytokinin 
C)  ethylene; auxin 
D)  cytokinin; auxin 
E)  cytokinin; ethylene 
A)  auxin; cytokinin 
B)  ethylene; cytokinin 
C)  ethylene; auxin 
D)  cytokinin; auxin 
E)  cytokinin; ethylene

Question 16

Which of the following does not increase during the initial stages of seed germination?

Accepted Answer

A)  Cell size 
B)  Respiration 
C)  RNA synthesis 
D)  DNA synthesis 
E)  Protein synthesis 
A)  Cell size 
B)  Respiration 
C)  RNA synthesis 
D)  DNA synthesis 
E)  Protein synthesis

Question 17

As a grass seed germinates, the embryonic plant secretes gibberellins, which

Accepted Answer

A)  absorb light. 
B)  cause stem elongation. 
C)  mobilize stored foods. 
D)  take up water. 
E)  direct the shoot upward. 
A)  absorb light. 
B)  cause stem elongation. 
C)  mobilize stored foods. 
D)  take up water. 
E)  direct the shoot upward.

Question 18

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.
-Stimulates axillary buds to grow into branches

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

The action of the plant hormones auxin and ethylene

Accepted Answer

A)  is mediated by identical signal transduction pathways. 
B)  requires specific receptors for each hormone in the plasma membrane. 
C)  involves the switching on of genes by similar mechanisms. 
D)  both involve activation of a transcription factor. 
E)  does not require receptor proteins. 
A)  is mediated by identical signal transduction pathways. 
B)  requires specific receptors for each hormone in the plasma membrane. 
C)  involves the switching on of genes by similar mechanisms. 
D)  both involve activation of a transcription factor. 
E)  does not require receptor proteins.

Question 20

Giberellins are plant hormones that affect

Accepted Answer

A)  stem growth. 
B)  fruit size. 
C)  seed germination. 
D)  All of the above 
E)  None of the above 
A)  stem growth. 
B)  fruit size. 
C)  seed germination. 
D)  All of the above 
E)  None of the above

Exam 37: Regulation of Plant Growth

Which of the following hormones would you supply to a dwarf plant to increase its height?

Use the following to answer questions : Refer to the diagram below, showing seed germination. -Identify the structures A and B in seed 1.

A germinating grass seedling embryo produces _______, which mobilize stored nutrients.

Before seed germination can begin,

Use the following to answer questions : Refer to the diagram below, showing an ethylene signal transduction pathway. -At the final outcome of the pathway, are genes turned "on" or "off"?

Use the following to answer questions : Refer to the diagram below, showing an ethylene signal transduction pathway. -Which membranes are indicated by labels E and F?

Phytochromes

Red light activation of the phytochorome into the Pfr state leads to which of the following events?

The effect of light on the growth and development of a plant is called

Treatment of some plants with gibberellins or auxin causes parthenocarpy, which is the

In their experiment with grass coleoptiles, Charles and Francis Darwin observed that the photoreceptor was _______ and the bending took place _______.

Phototropin is classified as a(n)

Which of the following does not occur in seed germination?

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

Two different hormones have opposing effects on senescence: _______ promotes it, whereas _______ inhibits it.

Which of the following does not increase during the initial stages of seed germination?

As a grass seed germinates, the embryonic plant secretes gibberellins, which

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. -Stimulates axillary buds to grow into branches

The action of the plant hormones auxin and ethylene

Giberellins are plant hormones that affect

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Red light activation of the phytochorome into the P_frstate leads to which of the following events?

In their experiment with grass coleoptiles, Charles and Francis Darwin observed that the photoreceptor was _ and the bending took place _.

Two different hormones have opposing effects on senescence: _ promotes it, whereas _ inhibits it.