Question 1

Refer to the following figure.   What will happen to the water in this experimental system?

Accepted Answer

A)  It will flow from left to right as pressure pushes it up the tube on the right. 
B)  It will flow from right to left until equilibrium is reached. 
C)  It will flow from left to right until equilibrium is reached. 
D)  It will flow from right to left until a pressure potential is generated. 
E)  Nothing; the system is most likely already at equilibrium. 
A)  It will flow from left to right as pressure pushes it up the tube on the right. 
B)  It will flow from right to left until equilibrium is reached. 
C)  It will flow from left to right until equilibrium is reached. 
D)  It will flow from right to left until a pressure potential is generated. 
E)  Nothing; the system is most likely already at equilibrium.

Question 2

Guard cells respond to changes in

Accepted Answer

A)  water potential. 
B)  temperature and sucrose concentration. 
C)  light levels and CO2 concentration. 
D)  K+ levels and temperature. 
E)  K+ levels and light level. 
A)  water potential. 
B)  temperature and sucrose concentration. 
C)  light levels and CO2 concentration. 
D)  K+ levels and temperature. 
E)  K+ levels and light level.

Question 3

The movement of water in plants caused by differences in pressure potential is called

Accepted Answer

A)  osmosis. 
B)  passive transport. 
C)  diffusion. 
D)  active transport. 
E)  bulk flow. 
A)  osmosis. 
B)  passive transport. 
C)  diffusion. 
D)  active transport. 
E)  bulk flow.

Question 4

Why is turgor pressure important for plants?

Accepted Answer

When its cells are turgid an h

Question 5

In the absence of ATP, xylem would be composed mostly of

Accepted Answer

A)  minerals. 
B)  water. 
C)  water and minerals. 
D)  lignin. 
E)  carbohydrates. 
A)  minerals. 
B)  water. 
C)  water and minerals. 
D)  lignin. 
E)  carbohydrates.

Question 6

A plant cell is isolated and placed in a water bath.Due to dissolved solutes within the cell, the cell has a negative solute potential (F1F1F1S1F1F1F10s = F1F1F1S1F1F1F101.3 MPa).At the same time, placing the cell in the water bath creates a positive pressure potential within the cell (F1F1F1S1F1F1F10p = 1.5 MPa).Which of the following regarding the water potential within the cell (F1F1F1S1F1F1F10cell) is true?

Accepted Answer

A)  F1F1F1S1F1F1F10cell is the product of the two values (i.e., F1F1F1S1F1F1F10 = F1F1F1S1F1F1F101.95 MPa), and there is a net movement of water into the cell. 
B)  F1F1F1S1F1F1F10cell is the product of the two values (i.e., F1F1F1S1F1F1F10 = F1F1F1S1F1F1F101.95 MPa), and there is a net movement of water out of the cell. 
C)  F1F1F1S1F1F1F10 cell is the sum of the two values (i.e., F1F1F1S1F1F1F10 = 0.2 MPa), and there is a net movement of water into the cell. 
D)  F1F1F1S1F1F1F10 cell is the sum of the two values (i.e., F1F1F1S1F1F1F10 = 0.2 MPa), and there is a net movement of water out of the cell. 
E)  F1F1F1S1F1F1F10 cell is the difference of the two values (i.e., F1F1F1S1F1F1F10 = 2.8 MPa), and there is a net movement of water out of the cell. 
A)  F1F1F1S1F1F1F10cell is the product of the two values (i.e., F1F1F1S1F1F1F10 = F1F1F1S1F1F1F101.95 MPa), and there is a net movement of water into the cell. 
B)  F1F1F1S1F1F1F10cell is the product of the two values (i.e., F1F1F1S1F1F1F10 = F1F1F1S1F1F1F101.95 MPa), and there is a net movement of water out of the cell. 
C)  F1F1F1S1F1F1F10 cell is the sum of the two values (i.e., F1F1F1S1F1F1F10 = 0.2 MPa), and there is a net movement of water into the cell. 
D)  F1F1F1S1F1F1F10 cell is the sum of the two values (i.e., F1F1F1S1F1F1F10 = 0.2 MPa), and there is a net movement of water out of the cell. 
E)  F1F1F1S1F1F1F10 cell is the difference of the two values (i.e., F1F1F1S1F1F1F10 = 2.8 MPa), and there is a net movement of water out of the cell.

Question 7

Refer to the table below.   Assume that you are a scientist interested in how water potential affects the flow of water in different tubes.You measure water potential (F1F1F1S1F1F1F10) in five experimental tubes designed to simulate the xylem of a tree.For each tube, you measure water potential in three different locations labeled sites 1, 2, and 3.For which experimental trial, shown in the table, would you expect the water to flow most freely from site 1 to site 3, based on the data?

Accepted Answer

A)  L 
B)  M 
C)  N 
D)  O 
E)  P 
A)  L 
B)  M 
C)  N 
D)  O 
E)  P

Question 8

To initiate stomatal opening, K+ ions

Accepted Answer

A)  are actively transported into guard cells. 
B)  passively diffuse out of guard cells. 
C)  are driven into guard cells by a charge gradient. 
D)  are actively transported out of guard cells. 
E)  bond to receptor sites on guard cell walls. 
A)  are actively transported into guard cells. 
B)  passively diffuse out of guard cells. 
C)  are driven into guard cells by a charge gradient. 
D)  are actively transported out of guard cells. 
E)  bond to receptor sites on guard cell walls.

Question 9

Which term best describes a plant cell that has been placed in distilled water for 24 hours?

Accepted Answer

A)  Full 
B)  Turgid 
C)  Rounded 
D)  Flaccid 
E)  Desiccated 
A)  Full 
B)  Turgid 
C)  Rounded 
D)  Flaccid 
E)  Desiccated

Question 10

Prior to 1893 it was thought that root cells were responsible for

Accepted Answer

A)  transpiration. 
B)  pumping water upward. 
C)  cohesion. 
D)  transportation of sucrose. 
E)  bulk flow. 
A)  transpiration. 
B)  pumping water upward. 
C)  cohesion. 
D)  transportation of sucrose. 
E)  bulk flow.

Question 11

The structure that prevents water and ions in the apoplast from crossing the endodermis is the _______.

Accepted Answer

The answer of The structure that prevents water and ions...

Question 12

Guard cells take up water due to an increase in ion concentrations.This results in

Accepted Answer

A)  the guard cells shrinking. 
B)  water intake and opening of stomata. 
C)  water intake and closing of stomata. 
D)  water loss and opening of stomata. 
E)  no effects on the guard cells except in darkness. 
A)  the guard cells shrinking. 
B)  water intake and opening of stomata. 
C)  water intake and closing of stomata. 
D)  water loss and opening of stomata. 
E)  no effects on the guard cells except in darkness.

Question 13

Which statement regarding sinks and sources is false?

Accepted Answer

A)  Certain plant structures can potentially be either sinks or sources, depending on the circumstances. 
B)  Translocation connects sources to sinks. 
C)  Fruits can be considered either sinks or sources. 
D)  Bulk flow connects sources to sinks. 
E)  A flower can be considered a sink as well as a source. 
A)  Certain plant structures can potentially be either sinks or sources, depending on the circumstances. 
B)  Translocation connects sources to sinks. 
C)  Fruits can be considered either sinks or sources. 
D)  Bulk flow connects sources to sinks. 
E)  A flower can be considered a sink as well as a source.

Question 14

K+ ions are able to move against their concentration gradient across the cell membrane because they

Accepted Answer

A)  flow with water entering the cell. 
B)  are actively transported across the membrane. 
C)  move with the electrical gradient. 
D)  are coupled with H+ ions. 
E)  are subject to osmosis. 
A)  flow with water entering the cell. 
B)  are actively transported across the membrane. 
C)  move with the electrical gradient. 
D)  are coupled with H+ ions. 
E)  are subject to osmosis.

Question 15

Bulk flow moves solution from a region of _______ to a region of _______.

Accepted Answer

A)  higher water potential; lower solute potential. 
B)  low turgor pressure; high turgor pressure. 
C)  higher pressure potential; lower pressure potential. 
D)  lower solute potential; higher solute potential. 
E)  lower pressure potential; higher pressure potential. 
A)  higher water potential; lower solute potential. 
B)  low turgor pressure; high turgor pressure. 
C)  higher pressure potential; lower pressure potential. 
D)  lower solute potential; higher solute potential. 
E)  lower pressure potential; higher pressure potential.

Question 16

Companion cells are linked with their sieve tube elements through

Accepted Answer

A)  sieve plates. 
B)  plasmodesmata. 
C)  xylem vessels. 
D)  mesophyll cells. 
E)  bulk flow. 
A)  sieve plates. 
B)  plasmodesmata. 
C)  xylem vessels. 
D)  mesophyll cells. 
E)  bulk flow.

Question 17

Why is it that the translocation of phloem sap requires energy but the transport of xylem sap does not?

Accepted Answer

Although the forces of transpiration, te

Question 18

In the late 1800s scientists were first interested in testing the hypothesis that roots are responsible for actively pumping water up a tree.How did they test this?

Accepted Answer

By removing the root

Question 19

When sugars are actively transported into a cell, turgor pressure inside that cell _______, because _______ turgor pressure.

Accepted Answer

A)  does not change; sugar concentration has no effect on 
B)  increases; sugar concentration directly affects 
C)  increases; water enters the cell and affects 
D)  decreases; water exits the cell, which affects 
E)  decreases; sugar concentration directly affects 
A)  does not change; sugar concentration has no effect on 
B)  increases; sugar concentration directly affects 
C)  increases; water enters the cell and affects 
D)  decreases; water exits the cell, which affects 
E)  decreases; sugar concentration directly affects

Question 20

Transport in the xylem is driven primarily by

Accepted Answer

A)  ATP hydrolysis. 
B)  root pressure. 
C)  guttation. 
D)  the evaporation of water from leaves. 
E)  the cohesion of water. 
A)  ATP hydrolysis. 
B)  root pressure. 
C)  guttation. 
D)  the evaporation of water from leaves. 
E)  the cohesion of water.

Exam 34: Transport in Plants

Refer to the following figure. What will happen to the water in this experimental system?

Guard cells respond to changes in

The movement of water in plants caused by differences in pressure potential is called

Why is turgor pressure important for plants?

In the absence of ATP, xylem would be composed mostly of

To initiate stomatal opening, K+ ions

Which term best describes a plant cell that has been placed in distilled water for 24 hours?

Prior to 1893 it was thought that root cells were responsible for

The structure that prevents water and ions in the apoplast from crossing the endodermis is the _______.

Guard cells take up water due to an increase in ion concentrations.This results in

Which statement regarding sinks and sources is false?

K+ ions are able to move against their concentration gradient across the cell membrane because they

Bulk flow moves solution from a region of _______ to a region of _______.

Companion cells are linked with their sieve tube elements through

Why is it that the translocation of phloem sap requires energy but the transport of xylem sap does not?

In the late 1800s scientists were first interested in testing the hypothesis that roots are responsible for actively pumping water up a tree.How did they test this?

When sugars are actively transported into a cell, turgor pressure inside that cell _______, because _______ turgor pressure.

Transport in the xylem is driven primarily by

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To initiate stomatal opening, K⁺ ions

K⁺ ions are able to move against their concentration gradient across the cell membrane because they

Bulk flow moves solution from a region of _ to a region of _.

When sugars are actively transported into a cell, turgor pressure inside that cell _, because _ turgor pressure.