Question 1

Suppose that a living plant cell is placed in a beaker with pure water. How long will it take up water?

Accepted Answer

A)  until it is flaccid 
B)  until it is turgid 
C)  until it is shrunken 
D)  until it is plasmolyzed 
A)  until it is flaccid 
B)  until it is turgid 
C)  until it is shrunken 
D)  until it is plasmolyzed B

Question 2

What generally causes stomata to close?

Accepted Answer

A)  nightlight 
B)  daylight 
C)  high moisture 
D)  high K+ content 
A)  nightlight 
B)  daylight 
C)  high moisture 
D)  high K+ content A

Question 3

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.
-companion cells

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 B

Question 4

According to the cohesion-tension mechanism of water transport, why does cohesion occur?

Accepted Answer

A)  because water molecules tend to form hydrogen bonds with each other 
B)  because water is pushed into the xylem by bulk flow 
C)  because waxy coatings on the insides of xylem keep water molecules together in the xylem 
D)  because evaporation removes water from the leaves 
A)  because water molecules tend to form hydrogen bonds with each other 
B)  because water is pushed into the xylem by bulk flow 
C)  because waxy coatings on the insides of xylem keep water molecules together in the xylem 
D)  because evaporation removes water from the leaves

Question 5

What are the primary aspects of the process used by a tall tree to move water to the leaves at the top of the tree?

Accepted Answer

A)  positive pressure from roots and cohesion 
B)  cohesion and evaporation 
C)  capillary action and pumps 
D)  capillary action and positive pressure from roots 
A)  positive pressure from roots and cohesion 
B)  cohesion and evaporation 
C)  capillary action and pumps 
D)  capillary action and positive pressure from roots

Question 6

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.
-transport of sugars

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 7

What is the solute potential (øs) of a living plant cell in a living leaf that is not wilted relative to the fluids surrounding the cell?

Accepted Answer

A)  typically lower 
B)  typically higher 
C)  varies widely from higher to lower 
D)  typically about the same 
A)  typically lower 
B)  typically higher 
C)  varies widely from higher to lower 
D)  typically about the same

Question 8

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.
-stomata

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 9

What route is being followed by water that moves through non-living regions of a root, such as air spaces in root tissue?

Accepted Answer

A)  the apoplastic, transmembrane, and epidermal pathways 
B)  the symplastic, transmembrane, and transepidermal pathways 
C)  the transmembrane, epidermal, and transepidermal pathways 
D)  the apoplastic, transmembrane, and symplastic pathways 
A)  the apoplastic, transmembrane, and epidermal pathways 
B)  the symplastic, transmembrane, and transepidermal pathways 
C)  the transmembrane, epidermal, and transepidermal pathways 
D)  the apoplastic, transmembrane, and symplastic pathways

Question 10

What needs to happen to the K+ concentration in guard cells for the stomata to open?

Accepted Answer

A)  It needs to fluctuate. 
B)  It needs to remain unchanged. 
C)  It needs to decrease. 
D)  It needs to increase. 
A)  It needs to fluctuate. 
B)  It needs to remain unchanged. 
C)  It needs to decrease. 
D)  It needs to increase.

Question 11

Which plant organelle stores solutes and plays a major role in maintaining turgor pressure?

Accepted Answer

A)  chloroplast 
B)  mitochondrion 
C)  vacuole 
D)  cell wall 
A)  chloroplast 
B)  mitochondrion 
C)  vacuole 
D)  cell wall

Question 12

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.
-bulk flow

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 13

Which phrase best describes the exodermis?

Accepted Answer

A)  the outer layer of roots, including root hairs 
B)  the above-ground continuation of the endodermis 
C)  the substitute for the endodermis in gymnosperms 
D)  found in the roots of most flowering plants 
A)  the outer layer of roots, including root hairs 
B)  the above-ground continuation of the endodermis 
C)  the substitute for the endodermis in gymnosperms 
D)  found in the roots of most flowering plants

Question 14

Suppose that a living plant cell is placed in a beaker with a solution that has a ø value lower than the ø value of the plant cell. What will happen to the plant cell?

Accepted Answer

A)  It will lose water until its øs = its øp. 
B)  It will take up water until within the cell øp = -øs. 
C)  It will take up water until its ø = øs of the solution. 
D)  It will lose water until its ø = ø of the solution. 
A)  It will lose water until its øs = its øp. 
B)  It will take up water until within the cell øp = -øs. 
C)  It will take up water until its ø = øs of the solution. 
D)  It will lose water until its ø = ø of the solution.

Question 15

Which ion is pumped out of guard cells in order to increase their turgidity?

Accepted Answer

A)  H+ 
B)  Ca2+ 
C)  Na+ 
D)  K+ 
A)  H+ 
B)  Ca2+ 
C)  Na+ 
D)  K+

Question 16

Theoretically, based on the cohesion-tension mechanism, what should be the maximum height for the tallest trees?

Accepted Answer

A)  about 3 m 
B)  about 50 m 
C)  about 75 m 
D)  about 130 m 
A)  about 3 m 
B)  about 50 m 
C)  about 75 m 
D)  about 130 m

Question 17

Which term best describes the process by which sucrose is moved into a cell against its concentration gradient while at the same time, protons are moved into a cell with their concentration gradient?

Accepted Answer

A)  facilitated diffusion 
B)  a symport 
C)  an antiport 
D)  active transport 
A)  facilitated diffusion 
B)  a symport 
C)  an antiport 
D)  active transport

Question 18

What is the pressure potential (øp) of a living plant cell in a living leaf that is not wilted relative to that in the fluids surrounding the cell?

Accepted Answer

A)  typically about the same 
B)  varies widely from higher to lower 
C)  typically higher 
D)  typically lower 
A)  typically about the same 
B)  varies widely from higher to lower 
C)  typically higher 
D)  typically lower

Question 19

What generally causes stomata to open?

Accepted Answer

A)  the release of abscisic acid by the roots 
B)  a drop in CO2 concentration in leaf air spaces 
C)  an exposure to red light 
D)  a drop in O2 concentration in leaf air spaces 
A)  the release of abscisic acid by the roots 
B)  a drop in CO2 concentration in leaf air spaces 
C)  an exposure to red light 
D)  a drop in O2 concentration in leaf air spaces

Question 20

Which of the following are found on either side of a plant stoma?

Accepted Answer

A)  guard cells 
B)  trichomes 
C)  leaves 
D)  root hairs 
A)  guard cells 
B)  trichomes 
C)  leaves 
D)  root hairs

Exam 34: Transport in Plants

Suppose that a living plant cell is placed in a beaker with pure water. How long will it take up water?

What generally causes stomata to close?

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. -companion cells

According to the cohesion-tension mechanism of water transport, why does cohesion occur?

What are the primary aspects of the process used by a tall tree to move water to the leaves at the top of the tree?

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. -transport of sugars

What is the solute potential (øs) of a living plant cell in a living leaf that is not wilted relative to the fluids surrounding the cell?

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. -stomata

What route is being followed by water that moves through non-living regions of a root, such as air spaces in root tissue?

What needs to happen to the K+ concentration in guard cells for the stomata to open?

Which plant organelle stores solutes and plays a major role in maintaining turgor pressure?

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. -bulk flow

Which phrase best describes the exodermis?

Suppose that a living plant cell is placed in a beaker with a solution that has a ø value lower than the ø value of the plant cell. What will happen to the plant cell?

Which ion is pumped out of guard cells in order to increase their turgidity?

Theoretically, based on the cohesion-tension mechanism, what should be the maximum height for the tallest trees?

Which term best describes the process by which sucrose is moved into a cell against its concentration gradient while at the same time, protons are moved into a cell with their concentration gradient?

What is the pressure potential (øp) of a living plant cell in a living leaf that is not wilted relative to that in the fluids surrounding the cell?

What generally causes stomata to open?

Which of the following are found on either side of a plant stoma?

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

What is the solute potential (ø_s) of a living plant cell in a living leaf that is not wilted relative to the fluids surrounding the cell?

What needs to happen to the K⁺ concentration in guard cells for the stomata to open?

What is the pressure potential (ø_p) of a living plant cell in a living leaf that is not wilted relative to that in the fluids surrounding the cell?