Question 1

Which statement is true regarding the similarities and differences between xylem and phloem?

Accepted Answer

A)  Both rely on active transport. 
B)  Phloem relies on living cells to transport materials, whereas xylem does not. 
C)  Phloem relies on a negative pressure potential to pull sucrose in the same way that xylem relies on negative pressure potential to pull water. 
D)  Both rely on transpiration from leaves to propel fluid. 
E)  Only xylem relies on selective transport. 
A)  Both rely on active transport. 
B)  Phloem relies on living cells to transport materials, whereas xylem does not. 
C)  Phloem relies on a negative pressure potential to pull sucrose in the same way that xylem relies on negative pressure potential to pull water. 
D)  Both rely on transpiration from leaves to propel fluid. 
E)  Only xylem relies on selective transport.

Question 2

Positive pressure potential within a plant cell is most likely to result in

Accepted Answer

A)  a decrease in the diffusion of ions into that cell. 
B)  an increase in the diffusion of ions out of that cell. 
C)  a decrease in the uptake of water by that cell. 
D)  an increase in the uptake of water by that cell. 
E)  There is not enough information to make a definitive assessment. 
A)  a decrease in the diffusion of ions into that cell. 
B)  an increase in the diffusion of ions out of that cell. 
C)  a decrease in the uptake of water by that cell. 
D)  an increase in the uptake of water by that cell. 
E)  There is not enough information to make a definitive assessment.

Question 3

If a tree is girdled, the first thing that will occur is that the flow of _______ will slow.

Accepted Answer

A)  water from roots to branches 
B)  phloem sap from roots to branches 
C)  water from branches to roots 
D)  phloem sap from branches to roots 
E)  water from the soil to roots 
A)  water from roots to branches 
B)  phloem sap from roots to branches 
C)  water from branches to roots 
D)  phloem sap from branches to roots 
E)  water from the soil to roots

Question 4

Osmosis

Accepted Answer

A)  requires energy. 
B)  is the movement of water across a membrane from low solute concentration to high solute concentration. 
C)  is the movement of water across a membrane from high solute concentration to low solute concentration. 
D)  is the movement of solutes across the membrane from high solute concentration to low solute concentration. 
E)  is facilitated in plant cells by the pressure potential (turgor pressure). 
A)  requires energy. 
B)  is the movement of water across a membrane from low solute concentration to high solute concentration. 
C)  is the movement of water across a membrane from high solute concentration to low solute concentration. 
D)  is the movement of solutes across the membrane from high solute concentration to low solute concentration. 
E)  is facilitated in plant cells by the pressure potential (turgor pressure).

Question 5

Which of the following statements about transpiration is false?

Accepted Answer

A)  Water evaporation starts as water loss from the guard cells. 
B)  Water is lost from mesophyll cells. 
C)  Water columns move through the leaf. 
D)  Transpiration raises mesophyll solute concentrations. 
E)  Water diffuses into the atmosphere. 
A)  Water evaporation starts as water loss from the guard cells. 
B)  Water is lost from mesophyll cells. 
C)  Water columns move through the leaf. 
D)  Transpiration raises mesophyll solute concentrations. 
E)  Water diffuses into the atmosphere.

Question 6

Which of the following is most important in preventing a plant cell from bursting when the cell is placed in a solution having lower solute concentration than that inside the cell?

Accepted Answer

A)  Primary cell wall 
B)  Middle lamella 
C)  Vacuole 
D)  Plasma membrane 
E)  Aquaporins 
A)  Primary cell wall 
B)  Middle lamella 
C)  Vacuole 
D)  Plasma membrane 
E)  Aquaporins

Question 7

What initiates the increase in turgor pressure inside the guard cell?

Accepted Answer

A)  A decrease in water availability 
B)  A decrease in light availability 
C)  A decrease in K+ concentration 
D)  An increase in K+ concentration 
E)  An increase in stomata number 
A)  A decrease in water availability 
B)  A decrease in light availability 
C)  A decrease in K+ concentration 
D)  An increase in K+ concentration 
E)  An increase in stomata number

Question 8

With the planet gradually warming and water supplies beginning to dwindle, which of the following adaptations might you expect to see in deciduous trees as they adjust to the change in climate?

Accepted Answer

A)  Growing more leaves 
B)  Growing smaller leaves 
C)  Dropping their leaves earlier 
D)  Growing leaves with a higher density of stomata 
E)  Growing leaves with smaller guard cells 
A)  Growing more leaves 
B)  Growing smaller leaves 
C)  Dropping their leaves earlier 
D)  Growing leaves with a higher density of stomata 
E)  Growing leaves with smaller guard cells

Question 9

Based on the pressure flow model, phloem sap is most likely to flow from a

Accepted Answer

A)  flower bud to a leaf. 
B)  leaf to another leaf. 
C)  root to a leaf. 
D)  leaf to an expanding fruit. 
E)  dying leaf to a living leaf. 
A)  flower bud to a leaf. 
B)  leaf to another leaf. 
C)  root to a leaf. 
D)  leaf to an expanding fruit. 
E)  dying leaf to a living leaf.

Question 10

In most plants and under normal conditions, stomata open _______ and close _______.

Accepted Answer

A)  at sunset; at sunrise 
B)  just after dawn; around sunset 
C)  around midday; around midnight 
D)  in darkness; in direct sunlight 
E)  in direct sunlight; in the rain 
A)  at sunset; at sunrise 
B)  just after dawn; around sunset 
C)  around midday; around midnight 
D)  in darkness; in direct sunlight 
E)  in direct sunlight; in the rain

Question 11

Which type of plant is most likely to open its stomata at night rather than during the day?

Accepted Answer

A)  Cactus 
B)  Orange tree 
C)  Apple tree 
D)  Water lily 
E)  Lotus 
A)  Cactus 
B)  Orange tree 
C)  Apple tree 
D)  Water lily 
E)  Lotus

Question 12

Parenchyma cells within the stele facilitate movement of minerals from the _______ into the _______.

Accepted Answer

A)  cell wall; cytoplasm 
B)  cytoplasm; apoplast 
C)  apoplast; cell wall of the neighboring cell 
D)  cytoplasm; cytoplasm of the neighboring cell 
E)  apoplast; cytoplasm of the neighboring cell 
A)  cell wall; cytoplasm 
B)  cytoplasm; apoplast 
C)  apoplast; cell wall of the neighboring cell 
D)  cytoplasm; cytoplasm of the neighboring cell 
E)  apoplast; cytoplasm of the neighboring cell

Question 13

Which of the following represents, in correct order, the steps taken by a sucrose molecule as it travels in the phloem?

Accepted Answer

A)  Source companion cell F1F1F1S1F1F1F10 sieve tube F1F1F1S1F1F1F10 sink companion cell F1F1F1S1F1F1F10 sink F1F1F1S1F1F1F10 mesophyll 
B)  Mesophyll F1F1F1S1F1F1F10 sieve tube F1F1F1S1F1F1F10 sink companion cell F1F1F1S1F1F1F10 sink F1F1F1S1F1F1F10 source companion cell 
C)  Mesophyll F1F1F1S1F1F1F10 source companion cell F1F1F1S1F1F1F10 sieve tube F1F1F1S1F1F1F10 sink companion cell F1F1F1S1F1F1F10 sink 
D)  Sieve tube F1F1F1S1F1F1F10 sink companion cell F1F1F1S1F1F1F10 sink F1F1F1S1F1F1F10 mesophyll F1F1F1S1F1F1F10 source companion cell 
E)  Sink companion cell F1F1F1S1F1F1F10 sink F1F1F1S1F1F1F10 mesophyll F1F1F1S1F1F1F10 source companion cell F1F1F1S1F1F1F10 sieve tube 
A)  Source companion cell F1F1F1S1F1F1F10 sieve tube F1F1F1S1F1F1F10 sink companion cell F1F1F1S1F1F1F10 sink F1F1F1S1F1F1F10 mesophyll 
B)  Mesophyll F1F1F1S1F1F1F10 sieve tube F1F1F1S1F1F1F10 sink companion cell F1F1F1S1F1F1F10 sink F1F1F1S1F1F1F10 source companion cell 
C)  Mesophyll F1F1F1S1F1F1F10 source companion cell F1F1F1S1F1F1F10 sieve tube F1F1F1S1F1F1F10 sink companion cell F1F1F1S1F1F1F10 sink 
D)  Sieve tube F1F1F1S1F1F1F10 sink companion cell F1F1F1S1F1F1F10 sink F1F1F1S1F1F1F10 mesophyll F1F1F1S1F1F1F10 source companion cell 
E)  Sink companion cell F1F1F1S1F1F1F10 sink F1F1F1S1F1F1F10 mesophyll F1F1F1S1F1F1F10 source companion cell F1F1F1S1F1F1F10 sieve tube

Question 14

The Casparian strip is a component of the

Accepted Answer

A)  stele. 
B)  cortex. 
C)  xylem. 
D)  endodermis. 
E)  pericycle. 
A)  stele. 
B)  cortex. 
C)  xylem. 
D)  endodermis. 
E)  pericycle.

Question 15

Stomata are

Accepted Answer

A)  unique to monocots. 
B)  unique to eudicots. 
C)  unique to vascular plants. 
D)  unique to desert plants. 
E)  ancient structures found among nearly all plant species. 
A)  unique to monocots. 
B)  unique to eudicots. 
C)  unique to vascular plants. 
D)  unique to desert plants. 
E)  ancient structures found among nearly all plant species.

Question 16

Despite going against the concentration gradient, K+ ions are able to enter the cell due to the _______.

Accepted Answer

electroche

Question 17

Which of the following is true regarding aquaporins?

Accepted Answer

A)  They transport solutes. 
B)  They rely on differences in water potential for the transport of water. 
C)  They allow for active transport. 
D)  Their permeability is fixed. 
E)  They transport water against the concentration gradient. 
A)  They transport solutes. 
B)  They rely on differences in water potential for the transport of water. 
C)  They allow for active transport. 
D)  Their permeability is fixed. 
E)  They transport water against the concentration gradient.

Question 18

When are stomata most likely to be closed?

Accepted Answer

A)  When rates of photosynthesis are high 
B)  During the day 
C)  During periods of high water loss 
D)  During times of high CO2 demand 
E)  At all times; stomata are always closed 
A)  When rates of photosynthesis are high 
B)  During the day 
C)  During periods of high water loss 
D)  During times of high CO2 demand 
E)  At all times; stomata are always closed

Question 19

Researchers want to place radioactively labeled water into some isolated plant cells immersed in water for an isotope uptake experiment.To do so, they need to make the solute _______ more negative inside the cells so water moves into the cells passively by osmosis.

Accepted Answer

The answer of Researchers want to place radioactively labeled water...

Question 20

As water moves from roots to leaves

Accepted Answer

A)  water potential becomes more negative. 
B)  water potential becomes more positive. 
C)  water potential becomes more negative toward the trunk and more positive toward the leaves. 
D)  there is no net change in water potential. 
E)  changes in water potential are determined by the concentration of solutes. 
A)  water potential becomes more negative. 
B)  water potential becomes more positive. 
C)  water potential becomes more negative toward the trunk and more positive toward the leaves. 
D)  there is no net change in water potential. 
E)  changes in water potential are determined by the concentration of solutes.

Exam 34: Transport in Plants

Which statement is true regarding the similarities and differences between xylem and phloem?

Positive pressure potential within a plant cell is most likely to result in

If a tree is girdled, the first thing that will occur is that the flow of _______ will slow.

Osmosis

Which of the following statements about transpiration is false?

Which of the following is most important in preventing a plant cell from bursting when the cell is placed in a solution having lower solute concentration than that inside the cell?

What initiates the increase in turgor pressure inside the guard cell?

With the planet gradually warming and water supplies beginning to dwindle, which of the following adaptations might you expect to see in deciduous trees as they adjust to the change in climate?

Based on the pressure flow model, phloem sap is most likely to flow from a

In most plants and under normal conditions, stomata open _______ and close _______.

Which type of plant is most likely to open its stomata at night rather than during the day?

Parenchyma cells within the stele facilitate movement of minerals from the _______ into the _______.

Which of the following represents, in correct order, the steps taken by a sucrose molecule as it travels in the phloem?

The Casparian strip is a component of the

Stomata are

Despite going against the concentration gradient, K+ ions are able to enter the cell due to the _______.

Which of the following is true regarding aquaporins?

When are stomata most likely to be closed?

Researchers want to place radioactively labeled water into some isolated plant cells immersed in water for an isotope uptake experiment.To do so, they need to make the solute _______ more negative inside the cells so water moves into the cells passively by osmosis.

As water moves from roots to leaves

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In most plants and under normal conditions, stomata open _ and close _.

Parenchyma cells within the stele facilitate movement of minerals from the _ into the _.

Despite going against the concentration gradient, K⁺ ions are able to enter the cell due to the _______.