Question 1

Differentiation refers to changes in the structure of a cell so that it can perform a specific function.

Accepted Answer

A) True 
 B)False  True

Question 2

Internal environmental factors coordinating plant growth and development include ________.

Accepted Answer

A)   water quality
B)   light
C)   hormones
D)   temperature
E)   day length C

Question 3

The movement of a leaf blade on its petiole to keep the blade oriented perpendicular to the sun's rays throughout the day is facilitated by

Accepted Answer

A)   bulliform cells.
B)   motor cells.
C)   tracheids.
D)   passage cells.
E)   laticifers. B

Question 4

Variation in day and night temperatures may influence a species growth rate.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following functions as a precursor in the synthesis of gibberellins?

Accepted Answer

A)   Vitamin A
B)   cytokinin
C)   Vitamin D
D)   acetyl CoA
E)   starch

Question 6

Which of the following is used by nurseries to cause active plants to become dormant?

Accepted Answer

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

Question 7

This plant pigment has two forms; one form absorbs red light and is then converted into the second form that absorbs far-red light. The second form, after absorption of far-red light, is converted back into the red absorbing form. This pigment is

Accepted Answer

A)   cryptochrome.
B)   phytochrome.
C)   chlorophyll b.
D)   beta carotene.
E)   auxotropin.

Question 8

Naturally occurring and synthetic ________ such as 2,4-D, are the basis of many "weed killers", especially for broadleaf weeds in lawns.

Accepted Answer

A)   abscicic acid
B)   auxins
C)   cytokinins
D)   ethylene
E)   gibberellins

Question 9

Garner and Allard were responsible for coining the term photoperiodism.

Accepted Answer

A) True 
 B)False

Question 10

The applications of certain gibberellins to a lawn can cause it to turn green earlier in the spring.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following pertaining to auxins is true?

Accepted Answer

A)   Their migration from the cells where they originate is relatively slow.
B)   Their movement is polar.
C)   Their movement requires the expenditure of energy stored in ATP molecules.
D)   They tend to proceed through parenchyma cells surrounding vascular bundles.
E)   All of these answers are correct.

Question 12

Plants that have two critical photoperiods in order to flower are called

Accepted Answer

A)   short-day plants.
B)   long-day plants.
C)   day-neutral plants.
D)   critical-day plants.
E)   intermediate-day plants.

Question 13

A reduction in the elongation of stems subject to mechanical stresses is called

Accepted Answer

A)   cladorestriction.
B)   xylar reduction.
C)   thigmomorphogenesis.
D)   internode compression.
E)   skototropism.

Question 14

Phototropic responses may vary according to light intensity.

Accepted Answer

A) True 
 B)False

Question 15

The plant physiologist credited with the discovery of auxins was

Accepted Answer

A)   Frits Went.
B)   Charles Darwin.
C)   Francis Darwin.
D)   R. F. M. van Steveninck.
E)   P. F. Wareing.

Question 16

Absicsic acid is associated with maintaining ________ in buds and seeds.

Accepted Answer

A)   turgor pressure
B)   color
C)   dormancy
D)   growth and development
E)   steady rates of cell division

Question 17

Which of the following plant movements is due solely to an external stimulus?

Accepted Answer

A)   helical (spiraling)  movement
B)   nodding movement
C)   twining movement
D)   gravitropism
E)   None of these answers are correct.

Question 18

A precursor is

Accepted Answer

A)   a traveling electron.
B)   a growth-regulating substance.
C)   a simple molecule that is converted to a more complex molecule.
D)   a gene that determines writing style.
E)   one who is predisposed to using profanity.

Question 19

Apical dominance can be offset with an application of cytokinins to axillary buds.

Accepted Answer

A) True 
 B)False

Question 20

There probably is only one auxin naturally produced by plants.

Accepted Answer

A) True 
 B)False

Exam 11: Growth

Differentiation refers to changes in the structure of a cell so that it can perform a specific function.

Internal environmental factors coordinating plant growth and development include ________.

The movement of a leaf blade on its petiole to keep the blade oriented perpendicular to the sun's rays throughout the day is facilitated by

Variation in day and night temperatures may influence a species growth rate.

Which of the following functions as a precursor in the synthesis of gibberellins?

Which of the following is used by nurseries to cause active plants to become dormant?

This plant pigment has two forms; one form absorbs red light and is then converted into the second form that absorbs far-red light. The second form, after absorption of far-red light, is converted back into the red absorbing form. This pigment is

Naturally occurring and synthetic ________ such as 2,4-D, are the basis of many "weed killers", especially for broadleaf weeds in lawns.

Garner and Allard were responsible for coining the term photoperiodism.

The applications of certain gibberellins to a lawn can cause it to turn green earlier in the spring.

Which of the following pertaining to auxins is true?

Plants that have two critical photoperiods in order to flower are called

A reduction in the elongation of stems subject to mechanical stresses is called

Phototropic responses may vary according to light intensity.

The plant physiologist credited with the discovery of auxins was

Absicsic acid is associated with maintaining ________ in buds and seeds.

Which of the following plant movements is due solely to an external stimulus?

A precursor is

Apical dominance can be offset with an application of cytokinins to axillary buds.

There probably is only one auxin naturally produced by plants.