Question 1

An increase in root pressure will result in the rapid release of abscisic acid (ABA) and the subsequent opening of the stomata.

Accepted Answer

A) True 
 B)False

Question 2

Some plants are able to endure frequent flooding events because they contain a tissue with loose parenchyma cells and large air spaces called

Accepted Answer

A)  xylem.
B)  spongy mesophyll.
C)  pneumatophores.
D)  aerenchyma.E) A) and C)
F) B) and C)

Question 3

Halophytes are plants that live in saline soils.The high osmotic potential of the salt solution in the soil creates a very negative water potential.What can halophytes do so that water will flow into the roots?

Accepted Answer

A)  They can close their stomata so that less water is lost through transpiration.
B)  They can open all their stomata so that transpiration "pulls" more water into the roots.
C)  They can increase the solute concentration in their roots creating a water potential that is more negative than the soil.
D)  They can pump ions out of the plant creating a water potential in the roots that is more positive than the soil.E) A) and D)
F) B) and C)

Question 4

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

Question 5

A plant is exposed to a toxin that blocks ABA receptor sites in the plasma membrane.What is the likely consequence of this exposure?

Accepted Answer

A)  Oxygen deprivation will trigger the release of ethylene, which will in turn suppress root growth.
B)  Gibberellin production will increase, allowing the plant to access more nutrients in the soil.
C)  ABA will enter the cells by an alternative route and normal function will be restored.
D)  The plant will lose excess water through transpiration and suffer dehydration.E) A) and B)
F) B) and D)

Question 6

An application of too much fertilizer will negatively affect the movement of materials in the phloem.

Accepted Answer

A) True 
 B)False

Question 7

The uneven distribution of an impermeable solute on either side of a membrane will result in

Accepted Answer

A)  an increase in oxygen deprivation.
B)  proton pumping.
C)  root pressure.
D)  osmosis.E) B) and C)
F) B) and D)

Question 8

A plant will usually wilt when which component of water potential reaches 0 MPa?

Accepted Answer

A)  solute potential
B)  turgor pressure
C)  total water potential
D)  gravity potential When the pressure potential reaches 0 MPa within a cell, there is no more turgor pressure.This pressure is necessary to keep the cell wall rigid and to keep the plant from wilting.Please refer to section 37.1 for more information.E) All of the above
F) A) and D)

Question 9

A large watermelon fruit is very heavy and contains nearly 90% water.Since the skin of a watermelon is thick and lacks stomata, transpiration does not "pull" water into the watermelon.So, how does all that water get into the fruit?

Accepted Answer

A)  Root pressure pushes water into the watermelon.
B)  Water enters by osmosis from the soil.
C)  Water is pumped in by active transport.
D)  Water is transported in the phloem along with the sugars while they are being translocated into the fruit.E) C) and D)
F) A) and B)

Question 10

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

Question 11

The pressure-flow hypothesis describes

Accepted Answer

A)  how hormones move through the phloem.
B)  how carbohydrates enter the sieve tubes.
C)  how carbohydrates in solution move through the phloem.
D)  how water and minerals move through the xylem.E) B) and C)
F) A) and D)

Question 12

Mycorrhizal fungi interact with plants at the

Accepted Answer

A)  stomata.
B)  seed coat.
C)  roots.
D)  edge of ponds.E) B) and D)
F) B) and C)

Question 13

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) C) and D)
F) All of the above

Question 14

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

Question 15

Which of the following must occur in order to maintain a high pressure potential within guard cells?

Accepted Answer

A)  Potassium ions must be actively transported out.
B)  Energy must be constantly expended.
C)  Water must exit guard cells by osmosis.
D)  Stomata must take up more oxygen and less carbon dioxide.E) A) and C)
F) B) and C)

Question 16

Mangrove plants live in areas regularly flooded with salt water.Which of these is not a possible mechanism for controlling their salt balance?

Accepted Answer

A)  The roots block salt uptake.
B)  The succulent leaves contain large quantities of water that dilute salt that is absorbed.
C)  Absorbed salt is secreted from special salt glands.
D)  Modified roots emerge above the water level and help oxygen diffuse into the roots.E) None of the above
F) A) and D)

Question 17

In Cell 1,

Accepted Answer

A)   Ψ\PsiΨ p = 0.0 MPa and  Ψ\PsiΨ w = 0.0 MPa.
B)   Ψ\PsiΨ p = 0.0 MPa and  Ψ\PsiΨ w = -1.0 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) B) and C)
F) A) and D)

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

Cavitation would have no effect on translocation.

Accepted Answer

A) True 
 B)False

Question 20

You a given a plant tissue in lab and asked to determine if the tissue is a source or a sink.Microscopic analysis reveals an abundance of colorless parenchyma cells with plastids.Only one biochemical test reacts positively with your sample.In the presence of iodine, the plastids turn a dark purplish color.Based on this information you determine your sample is

Accepted Answer

A)  a source because your sample is rich in carbohydrates.
B)  a source because your sample contains plastids.
C)  a sink because your sample is rich in carbohydrates.
D)  both a source and sink because it contains both plastids and carbohydrates.E) B) and C)
F) All of the above

Exam 37: Transport in Plants

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

Correct Answer
verified

An application of too much fertilizer will negatively affect the movement of materials in the phloem.

Correct Answer
verified

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 Answer
verified

A plant is exposed to a toxin that blocks ABA receptor sites in the plasma membrane.What is the likely consequence of this exposure?

Correct Answer
verified

Which of the following must occur in order to maintain a high pressure potential within guard cells?

Correct Answer
verified

Halophytes are plants that live in saline soils.The high osmotic potential of the salt solution in the soil creates a very negative water potential.What can halophytes do so that water will flow into the roots?

Correct Answer
verified

Cavitation would have no effect on translocation.

Correct Answer
verified

Mycorrhizal fungi interact with plants at the

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

An increase in root pressure will result in the rapid release of abscisic acid (ABA) and the subsequent opening of the stomata.

Correct Answer
verified

Stomatal opening requires each of the following conditions, except

Correct Answer
verified

A plant will usually wilt when which component of water potential reaches 0 MPa?

Correct Answer
verified

In Cell 1,

Correct Answer
verified

Mangrove plants live in areas regularly flooded with salt water.Which of these is not a possible mechanism for controlling their salt balance?

Correct Answer
verified

Cavitation can occur when what happens?

Correct Answer
verified

Some plants are able to endure frequent flooding events because they contain a tissue with loose parenchyma cells and large air spaces called

Correct Answer
verified

The pressure-flow hypothesis describes

Correct Answer
verified

The uneven distribution of an impermeable solute on either side of a membrane will result in

Correct Answer
verified

A large watermelon fruit is very heavy and contains nearly 90% water.Since the skin of a watermelon is thick and lacks stomata, transpiration does not "pull" water into the watermelon.So, how does all that water get into the fruit?

Correct Answer
verified

Exam 37: Transport in Plants

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

Correct AnswerverifiedShow Answer

An application of too much fertilizer will negatively affect the movement of materials in the phloem.

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

A plant is exposed to a toxin that blocks ABA receptor sites in the plasma membrane.What is the likely consequence of this exposure?

Correct AnswerverifiedShow Answer

Which of the following must occur in order to maintain a high pressure potential within guard cells?

Correct AnswerverifiedShow Answer

Halophytes are plants that live in saline soils.The high osmotic potential of the salt solution in the soil creates a very negative water potential.What can halophytes do so that water will flow into the roots?

Correct AnswerverifiedShow Answer

Cavitation would have no effect on translocation.

Correct AnswerverifiedShow Answer

Mycorrhizal fungi interact with plants at the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An increase in root pressure will result in the rapid release of abscisic acid (ABA) and the subsequent opening of the stomata.

Correct AnswerverifiedShow Answer

Stomatal opening requires each of the following conditions, except

Correct AnswerverifiedShow Answer

A plant will usually wilt when which component of water potential reaches 0 MPa?

Correct AnswerverifiedShow Answer

In Cell 1,

Correct AnswerverifiedShow Answer

Mangrove plants live in areas regularly flooded with salt water.Which of these is not a possible mechanism for controlling their salt balance?

Correct AnswerverifiedShow Answer

Cavitation can occur when what happens?

Correct AnswerverifiedShow Answer

Some plants are able to endure frequent flooding events because they contain a tissue with loose parenchyma cells and large air spaces called

Correct AnswerverifiedShow Answer

The pressure-flow hypothesis describes

Correct AnswerverifiedShow Answer

The uneven distribution of an impermeable solute on either side of a membrane will result in

Correct AnswerverifiedShow Answer

A large watermelon fruit is very heavy and contains nearly 90% water.Since the skin of a watermelon is thick and lacks stomata, transpiration does not "pull" water into the watermelon.So, how does all that water get into the fruit?

Correct AnswerverifiedShow Answer

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