Question 1

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 C)
G) B) and D)

Question 2

Choose the letter of the best match from the following:
-Pore in leaf that regulates gas exchange.

Accepted Answer

A)  abscisic acid
B)  trichomes
C)  aquaporin
D)  endodermis
E)  stomateF) A) and D)
G) D) and E)

Question 3

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 cell protoplasts.
D)  through vessel members.
E)  from cell to cell across plasma membranes.F) B) and D)
G) A) and B)

Question 4

The process of moving water through a plant by transpiration works because water molecules stick to each other with

Accepted Answer

A)  turgor pressure.
B)  osmosis.
C)  ionic bonds.
D)  adhesion.
E)  hydrogen bonds.F) A) and B)
G) None of the above

Question 5

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

Question 6

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 stomates so that less water uptake is needed.
B)  They can open their stomates so that transpiration can "pull" more strongly to get the water into the roots.
C)  They can increase the solute concentrations in their roots more than the solute concentration of the soil.
D)  They can pump ions out of their roots.
E)  They form symbiotic relationships with mycorrhizal fungi.F) A) and B)
G) None of the above

Question 7

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)  pumping water out of their roots.F) A) and C)
G) A) and B)

Question 8

Mycorrhizal fungi interact with plants at the

Accepted Answer

A)  stomates.
B)  seed coat.
C)  roots.
D)  edge of ponds.
E)  cuticlE.F) A) and B)
G) A) and C)

Question 9

Which of these factors does not have a direct or indirect effect on how much the stomates are open?

Accepted Answer

A)  temperature
B)  carbon dioxide
C)  relative humidity
D)  light
E)  chlorophyllF) A) and B)
G) A) and C) E

Question 10

Mechanisms that evolved in plants to regulate the rate of water loss do not include

Accepted Answer

A)  becoming dormant during dry times of the year.
B)  losing leaves.
C)  producing leaves that are thick and hard.
D)  containing stomata in crypts or pits.
E)  increasing the number of water vacuoles in the cells.F) D) and E)
G) C) and E)

Question 11

A large watermelon fruit is very heavy and contains nearly 90% water.Since the skin of a watermelon is thick and contains no stomates,there is no way to evaporate water out of the watermelon to "pull" water into the watermelon by transpiration.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.
C)  Water is pumped in by active transport.
D)  Water,main part of the sap,is transported in the phloem along with the sugars while they are being translocated into the fruit.
E)  Watermelons lying on the ground absorb water directly from the soil.F) A) and D)
G) A) and E) D

Question 12

When maple trees are tapped in the spring there are no leaves to promote transpiration.What process and pressure still allows the upward movement of sap so maple syrup can be collected.

Accepted Answer

A)  transpiration in the xylem.
B)  water potential gradients.
C)  translocation in the phloem.
D)  osmosis and root pressure.
E)  low water potential.F) A) and B)
G) A) and D)

Question 13

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

Question 14

Which of these is not a reason that aphids feed on phloem?

Accepted Answer

A)  Phloem is under positive pressure,so when the aphid pierces a phloem tube,sap is pushed into its mouth.
B)  Xylem is under negative pressure,so it would be very difficult to suck the fluids.
C)  Phloem contains high concentrations of sugars,as well as some minerals and other nutrients.
D)  Xylem contains mostly water and fewer nutrients.
E)  In soft herbaceous plants,phloem is more accessible than xylem.F) B) and D)
G) A) and B)

Question 15

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) A) and D)
G) A) and B)

Question 16

Which of the following hormones increases when plants are flooded?

Accepted Answer

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

Question 17

Choose the letter of the best match from the following:
-Triggers K+ to pass rapidly out of guard cells.

Accepted Answer

A)  abscisic acid
B)  trichomes
C)  aquaporin
D)  endodermis
E)  stomateF) B) and D)
G) C) and D)

Question 18

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)  Excess salt is stored in special tissues.F) A) and D)
G) B) and C)

Question 19

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) B) and C)
G) A) and B)

Question 20

The movement of oxygen through the aquatic plant may depend on

Accepted Answer

A)  osmotic absorption by the roots.
B)  aquaporins.
C)  negative pressures created by transpiration.
D)  differences in the water potential of different tissues.
E)  aerenchyma tissuE.F) None of the above
G) All of the above

Exam 38: Transport in Plants

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

Choose the letter of the best match from the following: -Pore in leaf that regulates gas exchange.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The process of moving water through a plant by transpiration works because water molecules stick to each other with

Correct AnswerverifiedShow Answer

In Cell 3,

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

Some plants can tolerate flooding conditions by

Correct AnswerverifiedShow Answer

Mycorrhizal fungi interact with plants at the

Correct AnswerverifiedShow Answer

Which of these factors does not have a direct or indirect effect on how much the stomates are open?

Correct AnswerverifiedE

Mechanisms that evolved in plants to regulate the rate of water loss do not include

Correct AnswerverifiedShow Answer

A large watermelon fruit is very heavy and contains nearly 90% water.Since the skin of a watermelon is thick and contains no stomates,there is no way to evaporate water out of the watermelon to "pull" water into the watermelon by transpiration.So,how does all that water get into the fruit?

Correct AnswerverifiedD

When maple trees are tapped in the spring there are no leaves to promote transpiration.What process and pressure still allows the upward movement of sap so maple syrup can be collected.

Correct AnswerverifiedShow Answer

In Cell 1,

Correct AnswerverifiedC

Which of these is not a reason that aphids feed on phloem?

Correct AnswerverifiedShow Answer

Which of the following statements does not apply to aquaporins?

Correct AnswerverifiedShow Answer

Which of the following hormones increases when plants are flooded?

Correct AnswerverifiedShow Answer

Choose the letter of the best match from the following: -Triggers K+ to pass rapidly out of guard cells.

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

Stomatal opening requires each of the following conditions except

Correct AnswerverifiedShow Answer

The movement of oxygen through the aquatic plant may depend on

Correct AnswerverifiedShow Answer

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E

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D

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C

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Choose the letter of the best match from the following: -Triggers K⁺ to pass rapidly out of guard cells.

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