Question 1

The vine in the picture below is displaying

Accepted Answer

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

Question 2

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

Question 3

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 above. 
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 above. D

Question 4

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. 
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.

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

Which of the following is NOT a physiological change related to photoperiodism?

Accepted Answer

A) seed germination 
B) root branching 
C) breaking bud dormancy 
D) some flowering 
E) onset of senescence 
A) seed germination 
B) root branching 
C) breaking bud dormancy 
D) some flowering 
E) onset of senescence

Question 7

Which of the following statements best describes how plants use hormones during signal transduction?

Accepted Answer

A) The hormone will bind to a specific receptor in the plasma membrane.It will then trigger a series of relay proteins that alter the signal into one that will impact the cellular machinery.Once the machinery is altered a change in gene expression will occur causing a change in the physical expression of the plant. 
B) The hormone will trigger a series of relay proteins to alter the signal into one that will impact the cellular machinery.Once the signal is changed the hormone will bind to a specific receptor in the plasma membrane.It will then cause a change in gene expression to occur causing a change in the physical expression of the plant. 
C) The hormone will bind to a specific receptor in the plasma membrane.It will then trigger a series of relay proteins that alter the signal into one that will impact the cellular machinery.Once the machinery is altered a change in the physical expression will occur causing a change in the actual genes of the plant. 
D) None of these describes how plants use hormones during signal transduction. 
A) The hormone will bind to a specific receptor in the plasma membrane.It will then trigger a series of relay proteins that alter the signal into one that will impact the cellular machinery.Once the machinery is altered a change in gene expression will occur causing a change in the physical expression of the plant. 
B) The hormone will trigger a series of relay proteins to alter the signal into one that will impact the cellular machinery.Once the signal is changed the hormone will bind to a specific receptor in the plasma membrane.It will then cause a change in gene expression to occur causing a change in the physical expression of the plant. 
C) The hormone will bind to a specific receptor in the plasma membrane.It will then trigger a series of relay proteins that alter the signal into one that will impact the cellular machinery.Once the machinery is altered a change in the physical expression will occur causing a change in the actual genes of the plant. 
D) None of these describes how plants use hormones during signal transduction.

Question 8

A plant's response to an external stimulus involves receptors.A receptor that responds to light normally contains

Accepted Answer

A) a series of relay proteins. 
B) a pigment component. 
C) a transduction pathway. 
D) an end product of a metabolic pathway. 
A) a series of relay proteins. 
B) a pigment component. 
C) a transduction pathway. 
D) an end product of a metabolic pathway.

Question 9

Which of the following ions is affected by gibberellins and is also involved in signal transduction?

Accepted Answer

A) H+ 
B) Ca2+ 
C) Na+ 
D) Mg2+ 
A) H+ 
B) Ca2+ 
C) Na+ 
D) Mg2+

Question 10

Which of these external stimuli produce movement of a plant toward light?

Accepted Answer

A) negative gravitropism 
B) positive gravitropism 
C) thigmotropism 
D) negative phototropism 
E) positive phototropism 
A) negative gravitropism 
B) positive gravitropism 
C) thigmotropism 
D) negative phototropism 
E) positive phototropism

Question 11

Went's experiment in 1926 with oat coleoptiles showed that agar that absorbed auxin from the tips would cause a tipless shoot to curve away from the side where he had placed the agar,suggesting that auxin causes cells to elongate.

Accepted Answer

A) True 
 B)False

Question 12

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) cytokinins 
A) auxins 
B) ethylene 
C) gibberellins 
D) cytokinins

Question 13

In order for hormones like auxin to be used as a chemical signal within a plant it must travel through the xylem to reach the site of activity.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following hormones are believed to be involved in abscission?

Accepted Answer

A) ethylene 
B) auxin 
C) gibberellin 
D) All of the above are correct. 
A) ethylene 
B) auxin 
C) gibberellin 
D) All of the above are correct.

Question 15

Which of the following plant hormones is associated with the closure of stomata when a plant experiences water stress?

Accepted Answer

A) abscisic acid 
B) auxin 
C) cytokinin 
D) gibberellins 
A) abscisic acid 
B) auxin 
C) cytokinin 
D) gibberellins

Question 16

A hormone is produced in small amounts in a tissue,and it causes a physiological action within that same tissue soon after its production.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following secondary metabolites are used by humans as medicines and also have the ability to block DNA & RNA synthesis in insects?

Accepted Answer

A) alkaloids 
B) cyanogenic glycosides 
C) tannins 
D) proteinase inhibitors 
A) alkaloids 
B) cyanogenic glycosides 
C) tannins 
D) proteinase inhibitors

Question 18

Which of the following plant defense mechanisms is used in the commercial product asprin?

Accepted Answer

A) abscisic acid 
B) auxin 
C) jasmonic acid 
D) salicylic acid 
E) systemin 
A) abscisic acid 
B) auxin 
C) jasmonic acid 
D) salicylic acid 
E) systemin

Question 19

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. 
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.

Question 20

A hormone that causes cell division and is found in coconut milk and in dividing root tissue is

Accepted Answer

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

Exam 26: Flowering Plants: Control of Growth Responses

The vine in the picture below is displaying

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

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

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

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

Which of the following is NOT a physiological change related to photoperiodism?

Which of the following statements best describes how plants use hormones during signal transduction?

A plant's response to an external stimulus involves receptors.A receptor that responds to light normally contains

Which of the following ions is affected by gibberellins and is also involved in signal transduction?

Which of these external stimuli produce movement of a plant toward light?

Went's experiment in 1926 with oat coleoptiles showed that agar that absorbed auxin from the tips would cause a tipless shoot to curve away from the side where he had placed the agar,suggesting that auxin causes cells to elongate.

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

In order for hormones like auxin to be used as a chemical signal within a plant it must travel through the xylem to reach the site of activity.

Which of the following hormones are believed to be involved in abscission?

Which of the following plant hormones is associated with the closure of stomata when a plant experiences water stress?

A hormone is produced in small amounts in a tissue,and it causes a physiological action within that same tissue soon after its production.

Which of the following secondary metabolites are used by humans as medicines and also have the ability to block DNA & RNA synthesis in insects?

Which of the following plant defense mechanisms is used in the commercial product asprin?

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?

A hormone that causes cell division and is found in coconut milk and in dividing root tissue is

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