Question 1

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  False

Question 2

Water moves through a plant by each of the following methods except

Accepted Answer

A)  from cell to cell through plasmodesmata.
B)  through the Casparian strip.
C)  through the spaces between cells.
D)  through vessel members.E) A) and B)
F) C) and D)

Question 3

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  False

Question 4

In Cell 3,

Accepted Answer

A)   Ψ\PsiΨ p = 0.0 MPa and  Ψ\PsiΨ w = -0.5 MPa.
B)   Ψ\PsiΨ p = 0.0 MPa and  Ψ\PsiΨ w = 0.0 MPa.
C)   Ψ\PsiΨ p = +0.5 MPa and  Ψ\PsiΨ w = -0.5 MPa.
D)   Ψ\PsiΨ p = -0.5 MPa and  Ψ\PsiΨ w = -0.5 MPa. E) A) and D)
F) C) and D)

Question 5

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) A) and B)
F) A) and C)

Question 6

If the soil around a plant is treated with a fungicide, the plant may experience a decline in DNA synthesis.

Accepted Answer

A) True 
 B)False

Question 7

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) A) and B)
F) A) and C)

Question 8

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) None of the above
F) A) and B)

Question 9

Water is able to cross plant plasma membranes by a combination of

Accepted Answer

A)  osmosis and aquaporins.
B)  evaporation and diffusion.
C)  root pressure and turgidity.
D)  diffusion and phloem.E) B) and C)
F) C) and D) A

Question 10

Which of the following hormones increases when plants are flooded?

Accepted Answer

A)  gibberellin
B)  auxin
C)  ethylene
D)  cytokininE) B) and C)
F) None of the above

Question 11

Water molecules can "stick" to certain surfaces by

Accepted Answer

A)  adhesion.
B)  cohesion.
C)  root pressure.
D)  water pressure.E) A) and D)
F) All of the above

Question 12

Water may be lost in the form of liquid from the surface of leaves through a process known as

Accepted Answer

A)  guttation.
B)  cohesion.
C)  phloem loading.
D)  mesophyll adhesion.E) A) and B)
F) A) and C)

Question 13

Some plants can tolerate flooding conditions by

Accepted Answer

A)  formation of aerenchyma.
B)  opening their lenticels.
C)  forming additional adventitious roots.
D)  shedding their bark.E) All of the above
F) None of the above

Question 14

On a short-term basis, water loss in plants may be controlled by the

Accepted Answer

A)  bending of the petioles on the leaves.
B)  closing of the stele in the roots.
C)  closing of the stomata in the leaves to limit transpiration.
D)  opening of the stomata in the leaves to allow more carbon dioxide to enter.E) C) and D)
F) A) and C)

Question 15

Most of the water absorbed by the plant enters through the

Accepted Answer

A)  root apical meristem.
B)  root cap.
C)  root hairs.
D)  stomata.E) A) and B)
F) All of the above

Question 16

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 tubesE) None of the above
F) All of the above

Question 17

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) B) and C)
F) A) and D)

Question 18

Which of the following actions occurs in many plants when CO2 concentrations are high?

Accepted Answer

A)  Guard cells lose turgor, and the stomata close.
B)  Water evaporates at a higher rate than usual.
C)  CAM photosynthesis fixes CO2 at night.
D)  Oxygen is used by plants for photosynthesis.E) None of the above
F) A) and C)

Question 19

The process by which water is "pulled" up through the xylem columns of plants as it evaporates out of the leaves is called

Accepted Answer

A)  respiration.
B)  transpiration.
C)  osmosis.
D)  anhydration.E) A) and D)
F) C) and D)

Question 20

A decrease in the availability of ATP in a root cell could decrease the water potential of the cell.

Accepted Answer

A) True 
 B)False

Exam 37: Transport in Plants

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 AnswerverifiedFalse

Water moves through a plant by each of the following methods except

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedFalse

In Cell 3,

Correct AnswerverifiedShow Answer

Which of the following statements does not apply to aquaporins?

Correct AnswerverifiedShow Answer

If the soil around a plant is treated with a fungicide, the plant may experience a decline in DNA synthesis.

Correct AnswerverifiedShow Answer

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

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

Water is able to cross plant plasma membranes by a combination of

Correct AnswerverifiedA

Which of the following hormones increases when plants are flooded?

Correct AnswerverifiedShow Answer

Water molecules can "stick" to certain surfaces by

Correct AnswerverifiedShow Answer

Water may be lost in the form of liquid from the surface of leaves through a process known as

Correct AnswerverifiedShow Answer

Some plants can tolerate flooding conditions by

Correct AnswerverifiedShow Answer

On a short-term basis, water loss in plants may be controlled by the

Correct AnswerverifiedShow Answer

Most of the water absorbed by the plant enters through the

Correct AnswerverifiedShow Answer

Which of the following does not require expenditure of energy?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following actions occurs in many plants when CO2 concentrations are high?

Correct AnswerverifiedShow Answer

The process by which water is "pulled" up through the xylem columns of plants as it evaporates out of the leaves is called

Correct AnswerverifiedShow Answer

A decrease in the availability of ATP in a root cell could decrease the water potential of the cell.

Correct AnswerverifiedShow Answer

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False

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False

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A

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Which of the following actions occurs in many plants when CO₂ concentrations are high?

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