Question 1

Even in the absence of transpiration,some water can move into the roots and partially up the xylem columns.This phenomenon is due to

Accepted Answer

A)  flooding.
B)  stomatal opening.
C)  root pressure.
D)  proton pumps.
E)  phloem translocation.F) C) and E)
G) A) and B)

Question 2

Most often,the largest gradient in water potential is between

Accepted Answer

A)  roots and soil water.
B)  root xylem and shoot xylem.
C)  xylem and phloem.
D)  leaf cells and the intracellular spaces inside the leaves.
E)  the relative humidity inside the leaf and the relative humidity outside the plant.F) C) and D)
G) B) and E)

Question 3

Which of the following statements about transport through phloem is true?

Accepted Answer

A)  Transport only occurs from the roots to the shoot.
B)  It is aided by root pressure.
C)  The direction of flow can change at different times if the sources and sinks change.
D)  No energy is required.
E)  Mostly dissolved starch is transported.F) A) and D)
G) B) and C)

Question 4

Cavitation can occur when what happens?

Accepted Answer

A)  Root pressure pushes water up the xylem.
B)  Starch grains block the sieve tubes.
C)  Gas bubbles expand inside a tracheid or vessel member.
D)  Stomata get stuck closed.
E)  Clouds block sunlight shining on the leaves.F) A) and C)
G) B) and E)

Question 5

If the proton pumps of guard cell were damaged,transpiration would decrease.

Accepted Answer

A) True 
 B)False

Question 6

If a mutation decreased the radius of a xylem vessel threefold,there would be an 81-fold increase in the volume of liquid moving through the vessel.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following hormones increases when plants are flooded?

Accepted Answer

A)  gibberellin
B)  auxin
C)  ethylene
D)  cytokinin
E)  abscisic acidF) A) and D)
G) A) and C)

Question 8

Which of the following equations represents the total water potential of a plant?

Accepted Answer

A)  s2 + p2 = w2
B)  ψs = ψp + ψw
C)  ψp = ψw + ψs
D)  ψw = ψp + ψs
E)  ψw = ψp _ ψsF) B) and E)
G) C) and D)

Question 9

Cavitation would have no effect on translocation.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following does not require expenditure of energy?

Accepted Answer

A)  accumulation of ions inside a cell
B)  transport against a concentration gradient
C)  flow of sucrose and other carbohydrates once inside the sieve tubes
D)  the loading and unloading of carbohydrates from the sieve tubes
E)  opening or closing stomataF) A) and B)
G) A) and C)

Question 11

Which of the following is not transported within the plant by the xylem and/or the phloem?

Accepted Answer

A)  dissolved minerals
B)  sucrose
C)  growth-regulating hormones
D)  water
E)  starchF) C) and D)
G) B) and E)

Question 12

Water molecules can "stick" to certain surfaces by

Accepted Answer

A)  adhesion.
B)  cohesion.
C)  root pressure.
D)  water pressure.
E)  pneumatophores.F) A) and B)
G) A) and C)

Question 13

Which of these situations regarding phloem sources and sinks is not correct?

Accepted Answer

A)  The root of a carrot plant is a source.
B)  Young leaves are sinks.
C)  A growing pumpkin is a sink.
D)  In a seedling,the cotyledons would be sources.
E)  During autumn,deciduous tree roots would be a sink.F) All of the above
G) C) and D)

Question 14

Most carbohydrates manufactured in leaves and other photosynthetic parts are transported through the phloem to the rest of the plant by the process of

Accepted Answer

A)  transpiration.
B)  translocation.
C)  osmosis.
D)  receptor-mediated transport.
E)  turgor pressure.F) A) and B)
G) All of the above

Question 15

Pure water without applied pressure has a water potential that is equal to

Accepted Answer

A)  infinity.
B)  0) 0 MPa.
C)  1) 6 MPa.
D)  -2.0 MPa.
E)  atmospheric pressure.F) B) and E)
G) A) and B)

Question 16

Which of the following statements does not apply to aquaporins?

Accepted Answer

A)  They are water transport channels.
B)  They are unique to plant cells.
C)  They occur in the plasma membrane.
D)  They speed up osmosis.
E)  They do not alter the direction of water movement.F) B) and E)
G) B) and D)

Question 17

Stomatal opening requires each of the following conditions,except

Accepted Answer

A)  expenditure of energy.
B)  a reduction of turgor in the guard cells.
C)  water entering the guard cells by osmosis.
D)  a lower water potential in the guard cells.
E)  pumping of potassium ions into the guard cells.F) C) and D)
G) D) and E)

Question 18

Closing the stomata for an extended period of time would lead to an increase in G3P in the mesophyll cells.

Accepted Answer

A) True 
 B)False

Question 19

Which of these structures is not likely to contain significant amounts of aerenchyma tissue?

Accepted Answer

A)  mangrove pneumatophores
B)  rice roots
C)  water lily leaves
D)  cypress "knees"
E)  coconut tree rootsF) A) and E)
G) A) and D)

Question 20

Plants living in standing water often face which of the following problems?

Accepted Answer

A)  increased CO2 levels
B)  chilling of the roots
C)  oxygen deprivation
D)  loss of stomata
E)  harmful root pressureF) D) and E)
G) All of the above

Exam 36: Transport in Plants

Which of the following is not transported within the plant by the xylem and/or the phloem?

Correct AnswerverifiedShow Answer

Stomatal opening requires each of the following conditions,except

Correct AnswerverifiedShow Answer

Which of these situations regarding phloem sources and sinks is not correct?

Correct AnswerverifiedShow Answer

Which of the following statements about transport through phloem is true?

Correct AnswerverifiedShow Answer

Cavitation can occur when what happens?

Correct AnswerverifiedShow Answer

Which of the following equations represents the total water potential of a plant?

Correct AnswerverifiedShow Answer

Most often,the largest gradient in water potential is between

Correct AnswerverifiedShow Answer

Plants living in standing water often face which of the following problems?

Correct AnswerverifiedShow Answer

Which of these structures is not likely to contain significant amounts of aerenchyma tissue?

Correct AnswerverifiedShow Answer

Closing the stomata for an extended period of time would lead to an increase in G3P in the mesophyll cells.

Correct AnswerverifiedShow Answer

Which of the following hormones increases when plants are flooded?

Correct AnswerverifiedShow Answer

Cavitation would have no effect on translocation.

Correct AnswerverifiedShow Answer

Which of the following does not require expenditure of energy?

Correct AnswerverifiedShow Answer

If the proton pumps of guard cell were damaged,transpiration would decrease.

Correct AnswerverifiedShow Answer

Water molecules can "stick" to certain surfaces by

Correct AnswerverifiedShow Answer

Pure water without applied pressure has a water potential that is equal to

Correct AnswerverifiedShow Answer

Even in the absence of transpiration,some water can move into the roots and partially up the xylem columns.This phenomenon is due to

Correct AnswerverifiedShow Answer

Most carbohydrates manufactured in leaves and other photosynthetic parts are transported through the phloem to the rest of the plant by the process of

Correct AnswerverifiedShow Answer

Which of the following statements does not apply to aquaporins?

Correct AnswerverifiedShow Answer

If a mutation decreased the radius of a xylem vessel threefold,there would be an 81-fold increase in the volume of liquid moving through the vessel.

Correct AnswerverifiedShow Answer

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