Question 1

-This figure shows the signal transduction pathway in plants.What does "d" represent?

Accepted Answer

A)  response
B)  receptor
C)  hormone
D)  transduction
E)  reception C

Question 2

-This figure shows the signal transduction pathway in plants.What does "c" represent?

Accepted Answer

A)  response
B)  reception
C)  hormone
D)  receptor
E)  transduction A

Question 3

Which of the following enables plants to determine how much light a plant is getting?

Accepted Answer

A)  the apical site
B)  the statolith
C)  the coleoptile
D)  the petiole
E)  the abscission area D

Question 4

Which of the following have the largest effect on the biological clocks of plants?

Accepted Answer

A)  the temperature of the air
B)  the amount of water absorbed by the plant
C)  the pH of the soil
D)  the photoperiod
E)  the temperature of the soil

Question 5

Which example illustrates that plants have a signal transduction pathway that leads to the activation of genes for proteinase inhibitors?

Accepted Answer

A)  the production of primary metabolites
B)  a plant's response to light
C)  a plant's response to gravity
D)  the production of secondary metabolites
E)  the plant's response to wounds

Question 6

Leaves that close at night are said to exhibit which movements?

Accepted Answer

A)  circadian movements
B)  sleep movements
C)  phytochrome movements
D)  phototropic movements
E)  apical movements

Question 7

When a plant tracks the sun by means of turgor pressure changes in the petiole,this is called

Accepted Answer

A)  gravitropism.
B)  statotropism.
C)  heliotropism.
D)  thigmotropism.
E)  Thigmotropism

Question 8

Which of the following is sometimes referred to as the stress hormone because it initiates and maintains seed and bud dormancy?

Accepted Answer

A)  indoleacetic acid
B)  abscisic acid
C)  cytokinins
D)  gibberellins
E)  ethylene

Question 9

The protective sheath which surrounds the young leaves of a seedling is called the

Accepted Answer

A)  axillary bud.
B)  auxiliary branch.
C)  apical bud.
D)  statolith.
E)  coleoptilE.

Question 10

A plant physiologist is studying the cause of phototropism,which has what cause?

Accepted Answer

A)  Auxins move to the light side of the plant causing the cells to shrink.
B)  Gibberellins move to the light side of the plant causing the cells to shrink.
C)  Cytokinins move to the shady side of the plant and cause the cells to elongate.
D)  Abscisic acid moves to the shady side of the plant and cause the cells to elongate.
E)  Auxins move to the shady side of the plant and cause the cells to elongatE.

Question 11

The growth regulator that brings about the wound response is

Accepted Answer

A)  systemin.
B)  proteinase.
C)  taxol.
D)  nicotine.
E)  caffeinE.

Question 12

In which of the following actions is auxin involved?

Accepted Answer

A)  hydrotropism
B)  gravitropism
C)  thigmotropism
D)  cytotropism
E)  pigmotropism

Question 13

Which of the following exemplifies mutualism?

Accepted Answer

A)  Lima beans produce volatiles that attract carnivorous mites only when the plants are being damaged by a spider mite.
B)  The bullhorn acacia tree provides a home and food for ants that in turn protect the plant from herbivores.
C)  After a leaf is chewed or injured,a plant produces proteinase inhibitors.
D)  A plant with a viral infection initiates a hypersensitive response (HR) that seals off the infected area.
E)  Because the leaves of some passion flowers display physical structures resembling the yellow eggs of Heliconius butterflies,these butterflies do not lay eggs on this plant.

Question 14

Which of the following is a use for a group of plant hormones other than gibberellins?

Accepted Answer

A)  breaks the dormancy of buds
B)  increase the number of buds
C)  bring about the onset of flowers
D)  stimulates seed germination
E)  improve production of cereal grains

Question 15

When a ripe piece of fruit placed in a sealed glass container with several pieces of non-ripe fruit causes the non-ripe fruit to ripen,this is due to what group of plant hormones produced by the already ripe fruit?

Accepted Answer

A)  abscisic acid
B)  cytokinins
C)  gibberellins
D)  ethylene
E)  indoleacetic acid

Question 16

The process of growing a plant from cells or tissue in laboratory glassware is referred to as

Accepted Answer

A)  plant abscission culture.
B)  plant cytokinin culture.
C)  plant dormancy culture.
D)  plant coleoptile culture.
E)  plant tissue culturE.

Question 17

Which of the following statements about tropism is correct?

Accepted Answer

A)  Positive phototropism causes the roots to grow down.
B)  Negative gravitropism causes the roots to grow down.
C)  Positive phototropism causes the stem to grow up.
D)  Negative gravitropism causes the stem to grow down.
E)  Positive heliotropism causes the plant to grow away from the sun.

Question 18

You are growing tomatoes and cucumbers in your garden which flower independently of day length because these plants are

Accepted Answer

A)  long-day plants.
B)  phytochrome plants.
C)  short-day plants.
D)  photoperiod plants.
E)  day-neutral plants.

Question 19

If you were studying the internal mechanism by which a circadian rhythm is maintained in the absence of appropriate stimuli,you would be studying

Accepted Answer

A)  a biological clock.
B)  a short-day clock.
C)  a long-day clock.
D)  a day-neutral clock.
E)  a thigmotropic clock.

Question 20

If you were to place some auxin on one side of a tipless coleoptile,what would be the result?

Accepted Answer

A)  The shoot would bend away from the auxin.
B)  The shoot would increase in length on both sides.
C)  The shoot would bend toward the auxin.
D)  The shoot would shrink.
E)  The auxin would have no effect on this part of the plant.

Exam 24: Control of Growth Responses in Plants