Question 1

The direction of transport in the xylem is _______ while that in the phloem is _______.

Accepted Answer

A)  up and down; down 
B)  up; up and down 
C)  down; up and down 
D)  down; down 
E)  up; down 
A)  up and down; down 
B)  up; up and down 
C)  down; up and down 
D)  down; down 
E)  up; down

Question 2

Which of the following is not part of the transpiration-cohesion-tension mechanism?

Accepted Answer

A)  Water evaporates from the walls of mesophyll cells. 
B)  Removal of water from the xylem exerts a pull on the water column. 
C)  Water is remarkably cohesive. 
D)  The wider the tube, the greater the tension its water column can withstand. 
E)  At each step, water moves to a region with a more strongly negative water potential. 
A)  Water evaporates from the walls of mesophyll cells. 
B)  Removal of water from the xylem exerts a pull on the water column. 
C)  Water is remarkably cohesive. 
D)  The wider the tube, the greater the tension its water column can withstand. 
E)  At each step, water moves to a region with a more strongly negative water potential.

Question 3

Use the following to answer questions :
Refer to the diagram below, depicting vascular tissue of a stem.  
-Is the greater (less negative) pressure potential located in the upper xylem vessels or the lower xylem vessels?

Accepted Answer

The answer of Use the following to answer questions :
Refer...

Question 4

Cell walls and spaces between cells make up a compartment called the _______; the continuous cytoplasm of living cells connected by plasmodesmata is called the _______.

Accepted Answer

The answer of Cell walls and spaces between cells make...

Question 5

Cells in the leaf release abscisic acid in response to

Accepted Answer

A)  an excessively negative water potential. 
B)  a reduction in CO2. 
C)  the reduction in light at night. 
D)  an increase of Cl- in the stomata. 
E)  an increase in K+ in the stomata. 
A)  an excessively negative water potential. 
B)  a reduction in CO2. 
C)  the reduction in light at night. 
D)  an increase of Cl- in the stomata. 
E)  an increase in K+ in the stomata.

Question 6

Mineral ions enter the cell due to the force of an electrochemical gradient set up by the pumping of _______ out of the cells.

Accepted Answer

A)  K+ 
B)  Ca2+ 
C)  Na+ 
D)  H+ 
E)  Cl- 
A)  K+ 
B)  Ca2+ 
C)  Na+ 
D)  H+ 
E)  Cl-

Question 7

The opening and closing of the stomata are accomplished by the

Accepted Answer

A)  sieve tube. 
B)  guard cells. 
C)  process of translocation. 
D)  aquaporins. 
E)  xylem. 
A)  sieve tube. 
B)  guard cells. 
C)  process of translocation. 
D)  aquaporins. 
E)  xylem.

Question 8

Pure water under no applied pressure has a water potential of

Accepted Answer

A)  +10. 
B)  +1. 
C) 0. 
D)  -1. 
E)  -10. 
A)  +10. 
B)  +1. 
C) 0. 
D)  -1. 
E)  -10.

Question 9

The movement of water up the stems of tall plants is least dependent on which of the following factors?

Accepted Answer

A)  Guttation 
B)  Transpiration 
C)  Cohesion of water molecules 
D)  Tension within water columns 
E)  All of the above are of equal importance. 
A)  Guttation 
B)  Transpiration 
C)  Cohesion of water molecules 
D)  Tension within water columns 
E)  All of the above are of equal importance.

Question 10

The function of the Casparian strips is to

Accepted Answer

A)  divert water and minerals through the membranes of endodermal cells. 
B)  prevent water and minerals from entering the stele through the apoplast. 
C)  provide regulation for water and mineral movement in the plant. 
D)  All of the above 
E)  None of the above 
A)  divert water and minerals through the membranes of endodermal cells. 
B)  prevent water and minerals from entering the stele through the apoplast. 
C)  provide regulation for water and mineral movement in the plant. 
D)  All of the above 
E)  None of the above

Question 11

Water transport through the xylem results from _______ of water from the leaves and the subsequent _______ in the xylem, which pulls water up.

Accepted Answer

transpirat

Question 12

According to the pressure flow model, during fruit development, photosynthesizing leaves are the _______ and the fruit are the _______.

Accepted Answer

A)  sink; sink 
B)  sink; source 
C)  source; source 
D)  source; sink 
E)  source; source or sink 
A)  sink; sink 
B)  sink; source 
C)  source; source 
D)  source; sink 
E)  source; source or sink

Question 13

According to the pressure flow model for translocation,

Accepted Answer

A)  sugar concentration is highest near the sink area. 
B)  water enters the sieve tube by osmosis. 
C)  sugar is transported out of the sieve tubes near the source area. 
D)  osmosis accomplishes the bulk flow of water and nutrients. 
E)  little ATP expenditure is required. 
A)  sugar concentration is highest near the sink area. 
B)  water enters the sieve tube by osmosis. 
C)  sugar is transported out of the sieve tubes near the source area. 
D)  osmosis accomplishes the bulk flow of water and nutrients. 
E)  little ATP expenditure is required.

Question 14

Cohesion is the tendency of water molecules to attract _______ molecules by means of _______ bonds.

Accepted Answer

A)  other water; covalent 
B)  other water; hydrogen 
C)  cellulose; covalent 
D)  cellulose; hydrogen 
E)  lignin; covalent 
A)  other water; covalent 
B)  other water; hydrogen 
C)  cellulose; covalent 
D)  cellulose; hydrogen 
E)  lignin; covalent

Question 15

What happens when a large amount of water enters a plant cell?

Accepted Answer

A)  Entry of water increases as the water potential increases. 
B)  Entry of water is opposed by turgor pressure. 
C)  Water moves toward the region of more positive water potential. 
D)  Entry of water reduces the turgor pressure. 
E)  Entry of water causes increased active transport into the cell. 
A)  Entry of water increases as the water potential increases. 
B)  Entry of water is opposed by turgor pressure. 
C)  Water moves toward the region of more positive water potential. 
D)  Entry of water reduces the turgor pressure. 
E)  Entry of water causes increased active transport into the cell.

Question 16

Which structure of the leaf minimizes water loss?

Accepted Answer

A)  Cortex 
B)  Epidermis 
C)  Cuticle 
D)  Phloem 
E)  Xylem 
A)  Cortex 
B)  Epidermis 
C)  Cuticle 
D)  Phloem 
E)  Xylem

Question 17

Use the following to answer questions :
Refer to the diagram below, showing a cross section of a root.  
-Which path (A or
B) remains predominantly within the apoplast?

Accepted Answer

The answer of Use the following to answer questions :
Refer...

Question 18

Plant physiologists can obtain pure phloem sap from individual phloem cells by

Accepted Answer

A)  using tiny drills and capillary pipettes. 
B)  collecting material from aphid stylets. 
C)  obtaining liquids oozing from cut stem surfaces. 
D)  collecting droplets formed by guttation. 
E)  gathering the mycorrhizal fungi for subsequent analysis. 
A)  using tiny drills and capillary pipettes. 
B)  collecting material from aphid stylets. 
C)  obtaining liquids oozing from cut stem surfaces. 
D)  collecting droplets formed by guttation. 
E)  gathering the mycorrhizal fungi for subsequent analysis.

Question 19

In the xylem,

Accepted Answer

A)  the products of photosynthesis travel down the stem. 
B)  living, pumping cells push the sap upward. 
C)  the driving force is in the roots. 
D)  the sap is often under tension. 
E)  the sap must pass through sieve plates. 
A)  the products of photosynthesis travel down the stem. 
B)  living, pumping cells push the sap upward. 
C)  the driving force is in the roots. 
D)  the sap is often under tension. 
E)  the sap must pass through sieve plates.

Question 20

Stomata close when

Accepted Answer

A)  the abscisic acid level is high. 
B)  the concentration of CO2 in the leaf is low. 
C)  the leaf is exposed to blue light. 
D)  K+ moves into the guard cells. 
E)  Cl- moves into guard cells. 
A)  the abscisic acid level is high. 
B)  the concentration of CO2 in the leaf is low. 
C)  the leaf is exposed to blue light. 
D)  K+ moves into the guard cells. 
E)  Cl- moves into guard cells.

Exam 35: Transport in Plants

The direction of transport in the xylem is _______ while that in the phloem is _______.

Which of the following is not part of the transpiration-cohesion-tension mechanism?

Use the following to answer questions : Refer to the diagram below, depicting vascular tissue of a stem. -Is the greater (less negative) pressure potential located in the upper xylem vessels or the lower xylem vessels?

Cell walls and spaces between cells make up a compartment called the _______; the continuous cytoplasm of living cells connected by plasmodesmata is called the _______.

Cells in the leaf release abscisic acid in response to

Mineral ions enter the cell due to the force of an electrochemical gradient set up by the pumping of _______ out of the cells.

The opening and closing of the stomata are accomplished by the

Pure water under no applied pressure has a water potential of

The movement of water up the stems of tall plants is least dependent on which of the following factors?

The function of the Casparian strips is to

Water transport through the xylem results from _______ of water from the leaves and the subsequent _______ in the xylem, which pulls water up.

According to the pressure flow model, during fruit development, photosynthesizing leaves are the _______ and the fruit are the _______.

According to the pressure flow model for translocation,

Cohesion is the tendency of water molecules to attract _______ molecules by means of _______ bonds.

What happens when a large amount of water enters a plant cell?

Which structure of the leaf minimizes water loss?

Use the following to answer questions : Refer to the diagram below, showing a cross section of a root. -Which path (A or B) remains predominantly within the apoplast?

Plant physiologists can obtain pure phloem sap from individual phloem cells by

In the xylem,

Stomata close when

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The direction of transport in the xylem is _ while that in the phloem is _.

Cell walls and spaces between cells make up a compartment called the _; the continuous cytoplasm of living cells connected by plasmodesmata is called the _.

Water transport through the xylem results from _ of water from the leaves and the subsequent _ in the xylem, which pulls water up.

According to the pressure flow model, during fruit development, photosynthesizing leaves are the _ and the fruit are the _.

Cohesion is the tendency of water molecules to attract _ molecules by means of _ bonds.