Question 1

How would water flow if the ø of surrounding soil is higher than that in living root epidermal cells?

Accepted Answer

A)  Water would leave the root cells, making them flaccid. 
B)  Water would leave the root cells, making them turgid. 
C)  Water would enter the root cells, making them flaccid. 
D)  Water would enter the root cells, making them turgid. 
A)  Water would leave the root cells, making them flaccid. 
B)  Water would leave the root cells, making them turgid. 
C)  Water would enter the root cells, making them flaccid. 
D)  Water would enter the root cells, making them turgid.

Question 2

Match each term or phrase with the letter of the associated plant tissue. Each letter may be used once, more than once, or not at all.
-trichomes

Accepted Answer

A) xylem 
B) phloem 
C) both xylem and phloem 
D) neither xylem nor phloem 
A) xylem 
B) phloem 
C) both xylem and phloem 
D) neither xylem nor phloem

Question 3

How far are most leaf cells from a xylem vein?

Accepted Answer

A)  2.0 centimetres 
B)  1.0 centimetre 
C)  0.5 millimetres 
D)  50 micrometres 
A)  2.0 centimetres 
B)  1.0 centimetre 
C)  0.5 millimetres 
D)  50 micrometres

Question 4

What is the main form in which sugars are transported in the phloem sap?

Accepted Answer

A)  starch 
B)  fructose 
C)  lactose 
D)  sucrose 
A)  starch 
B)  fructose 
C)  lactose 
D)  sucrose

Question 5

Which of the following describes the state of stomata in most plants?

Accepted Answer

A)  They open during the night and close during the day. 
B)  They are nearly always open. 
C)  They are almost never open. 
D)  They open during the day and close during the night. 
A)  They open during the night and close during the day. 
B)  They are nearly always open. 
C)  They are almost never open. 
D)  They open during the day and close during the night.

Question 6

Which of the following characterizes the symplastic pathways in the root?

Accepted Answer

A)  the water moves into and through living cells and is moving through the cytoplasm 
B)  the water moves into and through living cells and is moving through the cell wall 
C)  the water moves into and through non-living cells and is moving through the cytoplasm 
D)  the water moves into and through non-living cells and is moving through the cell wall 
A)  the water moves into and through living cells and is moving through the cytoplasm 
B)  the water moves into and through living cells and is moving through the cell wall 
C)  the water moves into and through non-living cells and is moving through the cytoplasm 
D)  the water moves into and through non-living cells and is moving through the cell wall

Question 7

What is the general term for long-distance transport of substances in plants?

Accepted Answer

A)  osmosis 
B)  translocation 
C)  pressure flow 
D)  cohesion-tension 
A)  osmosis 
B)  translocation 
C)  pressure flow 
D)  cohesion-tension

Question 8

How do companion cells load most of the carbohydrates into sieve tube members?

Accepted Answer

A)  by symport 
B)  through carrier proteins 
C)  through plasmodesmata 
D)  by antiport 
A)  by symport 
B)  through carrier proteins 
C)  through plasmodesmata 
D)  by antiport

Question 9

Which route of water absorption is inhibited by the Casparian strip?

Accepted Answer

A)  the apoplastic pathway 
B)  the transplastic pathway 
C)  the symplastic pathway 
D)  the transmembrane pathway 
A)  the apoplastic pathway 
B)  the transplastic pathway 
C)  the symplastic pathway 
D)  the transmembrane pathway

Question 10

What is the major cost to plants for having cuticle-covered epidermis in the shoot system to reduce water loss?

Accepted Answer

A)  reduced oxygen uptake 
B)  reduced nitrogen uptake 
C)  reduced carbon dioxide uptake 
D)  reduced potassium uptake 
A)  reduced oxygen uptake 
B)  reduced nitrogen uptake 
C)  reduced carbon dioxide uptake 
D)  reduced potassium uptake

Question 11

Which of the following were used in studies to test and support the hypothesis that high pressure forces phloem sap to flow?

Accepted Answer

A)  radiolabelled sugars 
B)  radiolabelled hormones 
C)  aphids 
D)  vacuum chambers 
A)  radiolabelled sugars 
B)  radiolabelled hormones 
C)  aphids 
D)  vacuum chambers

Question 12

Suppose two living plant cells are in contact with each other such that water, but NOT solutes, can pass between them. Also suppose that the cells have the same water potential, and that one cell has $\varPsi$p=0.3 MPa and $\varPsi$s = -0.5 MPa, while the other cell has $\varPsi$s = -0.3 MPa. What is the $\varPsi$p of the second cell?

Accepted Answer

A)  $\varPsi$p = -0.8 MPa 
B)  $\varPsi$p = 0.1 MPa 
C)  $\varPsi$p = 0.5 MPa 
D)  $\varPsi$p = 0.8 MPa 
A)  $\varPsi$p = -0.8 MPa 
B)  $\varPsi$p = 0.1 MPa 
C)  $\varPsi$p = 0.5 MPa 
D)  $\varPsi$p = 0.8 MPa

Question 13

Suppose a living plant cell has $\varPsi$p = 0.4 MPa and $\varPsi$s = -0.5 MPa. Suppose also that the plant cell is placed into a beaker filled with a solution for which $\varPsi$=$\varPsi$s=-0.9 MPa. What will the cell then do?

Accepted Answer

A)  It will take up water until within the cell $\varPsi$p = -$\varPsi$s. 
B)  It will lose water until its $\varPsi$s = its $\varPsi$p. 
C)  It will lose water until its $\varPsi$= $\varPsi$of the solution. 
D)  It will take up water until it bursts. 
A)  It will take up water until within the cell $\varPsi$p = -$\varPsi$s. 
B)  It will lose water until its $\varPsi$s = its $\varPsi$p. 
C)  It will lose water until its $\varPsi$= $\varPsi$of the solution. 
D)  It will take up water until it bursts.

Question 14

How would an air temperature rise of 10?0?C typically affect evaporation from leaves?

Accepted Answer

A)  It would mostly eliminate evaporation. 
B)  It would double the rate of evaporation. 
C)  It would triple the rate of evaporation. 
D)  It would quadruple the rate of evaporation. 
A)  It would mostly eliminate evaporation. 
B)  It would double the rate of evaporation. 
C)  It would triple the rate of evaporation. 
D)  It would quadruple the rate of evaporation.

Question 15

Match each term or phrase with the letter of the associated plant tissue. Each letter may be used once, more than once, or not at all.
-primary transport of water from roots

Accepted Answer

A) xylem 
B) phloem 
C) both xylem and phloem 
D) neither xylem nor phloem 
A) xylem 
B) phloem 
C) both xylem and phloem 
D) neither xylem nor phloem

Question 16

What is the principal driving force for guttation?

Accepted Answer

A)  pumping by the xylem cells 
B)  sunlight 
C)  passive transport 
D)  root pressure 
A)  pumping by the xylem cells 
B)  sunlight 
C)  passive transport 
D)  root pressure

Question 17

What is the water potential of phloem relative to the water potential of the surrounding xylem?

Accepted Answer

A)  lower 
B)  higher 
C)  about the same 
D)  exactly the same 
A)  lower 
B)  higher 
C)  about the same 
D)  exactly the same

Question 18

Which of the following best describes the mechanism(s) by which water can move inside a root?

Accepted Answer

A)  apoplastic, transmembrane, and symplastic pathways 
B)  transmembrane and symplastic pathways 
C)  transmembrane pathway 
D)  apoplastic pathway 
A)  apoplastic, transmembrane, and symplastic pathways 
B)  transmembrane and symplastic pathways 
C)  transmembrane pathway 
D)  apoplastic pathway

Question 19

What is the waxy substance suberin typically associated with?

Accepted Answer

A)  root hairs 
B)  tonoplasts 
C)  endodermis 
D)  pericycle 
A)  root hairs 
B)  tonoplasts 
C)  endodermis 
D)  pericycle

Question 20

Which is the most widely accepted and supported model for explaining the movement of xylem sap?

Accepted Answer

A)  the transpiration mechanism 
B)  the osmosis mechanism 
C)  the pressure flow mechanism 
D)  the cohesion-tension mechanism 
A)  the transpiration mechanism 
B)  the osmosis mechanism 
C)  the pressure flow mechanism 
D)  the cohesion-tension mechanism

Exam 34: Transport in Plants

How would water flow if the ø of surrounding soil is higher than that in living root epidermal cells?

Match each term or phrase with the letter of the associated plant tissue. Each letter may be used once, more than once, or not at all. -trichomes

How far are most leaf cells from a xylem vein?

What is the main form in which sugars are transported in the phloem sap?

Which of the following describes the state of stomata in most plants?

Which of the following characterizes the symplastic pathways in the root?

What is the general term for long-distance transport of substances in plants?

How do companion cells load most of the carbohydrates into sieve tube members?

Which route of water absorption is inhibited by the Casparian strip?

What is the major cost to plants for having cuticle-covered epidermis in the shoot system to reduce water loss?

Which of the following were used in studies to test and support the hypothesis that high pressure forces phloem sap to flow?

Suppose a living plant cell has Ψ\varPsiΨ p = 0.4 MPa and Ψ\varPsiΨ s = -0.5 MPa. Suppose also that the plant cell is placed into a beaker filled with a solution for which Ψ\varPsiΨ = Ψ\varPsiΨ s=-0.9 MPa. What will the cell then do?

How would an air temperature rise of 10?0?C typically affect evaporation from leaves?

Match each term or phrase with the letter of the associated plant tissue. Each letter may be used once, more than once, or not at all. -primary transport of water from roots

What is the principal driving force for guttation?

What is the water potential of phloem relative to the water potential of the surrounding xylem?

Which of the following best describes the mechanism(s) by which water can move inside a root?

What is the waxy substance suberin typically associated with?

Which is the most widely accepted and supported model for explaining the movement of xylem sap?

Light and Life

The Cell: an Overview

Energy and Enzymes

Cell Membranes and Signaling

Cellular Respiration

Photosynthesis

Cell Cycles

Genetic Recombination

The Chromosomal Basis of Mendelian Inheritance

Genetic Linkage, Sex-Linkage, and Other Non-Mendelian Inheritance Mechanisms

DNA Structure, Replication, and Repair

Gene Structure Expression, and Mutation

Regulation of Gene Expression

Dna Technologies

Genomes

Evolution: the Development of the Theory

Microevolution: Changes Within Populations

Speciation and Macroevolution

Systematics and Phylogenetics: Revealing the Tree of Life

Humans and Evolution

Defining Life and Its Origins

Viruses, Viroids, and Prions: Infectious Biological Particles

Bacteria and Archaea

Protists

Fungi

Plants

Animals

Conservation of Biodiversity

Population Ecology

Species Interactions and Community Ecology

Ecosystems

Animal Behaviour

Organization of the Plant Body

Reproduction and Development in Flowering Plants

Plant Nutrition

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Animal Nutrition

Gas Exchange: the Respiratory System

Internal Transport: the Circulatory System

Regulation of the Internal Environment: Water, Solutes, and Temperature

Control of Animal Processes: Endocrine Control

Animal Reproduction

Control of Animal Processes: Neural Control

Muscles, Skeletons, and Body Movements

Filters

Suppose a living plant cell has $\varPsi$ _p = 0.4 MPa and $\varPsi$ _s = -0.5 MPa. Suppose also that the plant cell is placed into a beaker filled with a solution for which $\varPsi$ = $\varPsi$ _s=-0.9 MPa. What will the cell then do?