Question 1

Which of the following accurately describes the direction phloem sap can flow?

Accepted Answer

A)  from leaves to stems only 
B)  from stems to leaves only 
C)  from leaves to roots only 
D)  from leaves to roots or roots to leaves 
A)  from leaves to stems only 
B)  from stems to leaves only 
C)  from leaves to roots only 
D)  from leaves to roots or roots to leaves

Question 2

Which of the following describes the Casparian strip in plant roots?

Accepted Answer

A)  it contains dense clusters of plasmodesmata 
B)  it forms within primary cell walls 
C)  it contains waxy deposits of cutin 
D)  it forms an impermeable barrier through the cytoplasm of endodermal cells 
A)  it contains dense clusters of plasmodesmata 
B)  it forms within primary cell walls 
C)  it contains waxy deposits of cutin 
D)  it forms an impermeable barrier through the cytoplasm of endodermal cells

Question 3

Which structure or compartment is part of the symplast?

Accepted Answer

A)  the interior of a vessel element 
B)  the interior of a sieve tube 
C)  the cell wall of a mesophyll cell 
D)  an extracellular air space 
A)  the interior of a vessel element 
B)  the interior of a sieve tube 
C)  the cell wall of a mesophyll cell 
D)  an extracellular air space

Question 4

Which of the following defines the loss of water from the aerial parts of plants?

Accepted Answer

A)  homeostasis 
B)  respiration 
C)  gas exchange 
D)  transpiration 
A)  homeostasis 
B)  respiration 
C)  gas exchange 
D)  transpiration

Question 5

Which of the following structures or molecules are required for active transport of amino acids in plants?

Accepted Answer

A)  channel proteins 
B)  vascular tissue 
C)  sodium/potassium pumps 
D)  ATP, transport proteins, and a proton gradient 
A)  channel proteins 
B)  vascular tissue 
C)  sodium/potassium pumps 
D)  ATP, transport proteins, and a proton gradient

Question 6

When an animal cell is placed in a hypotonic solution and water enters the cell via osmosis, the volume of the cell increases until it bursts. Which of the following explains why this does not happen to plant cells?

Accepted Answer

A)  they have large central vacuoles, which provide abundant space for storage of incoming water 
B)  they have cell walls, which prevent the entry of water by osmosis 
C)  they have cell walls, which provide pressure to counteract the pressure of the incoming water 
D)  certain gated channel proteins embedded in their plasma membranes open as osmotic pressure decreases, allowing excess water to leave the cell 
A)  they have large central vacuoles, which provide abundant space for storage of incoming water 
B)  they have cell walls, which prevent the entry of water by osmosis 
C)  they have cell walls, which provide pressure to counteract the pressure of the incoming water 
D)  certain gated channel proteins embedded in their plasma membranes open as osmotic pressure decreases, allowing excess water to leave the cell

Question 7

If a water molecule in a plant did "circulate" (that is, go from one point in a plant to another and back in the same day), it would require the activity of which of the following?

Accepted Answer

A)  only the xylem 
B)  only the phloem 
C)  only the endodermis 
D)  both the xylem and the phloem 
A)  only the xylem 
B)  only the phloem 
C)  only the endodermis 
D)  both the xylem and the phloem

Question 8

Which of the following is a result of the high surface-to-volume ratio of leaves?

Accepted Answer

A)  thick leaves 
B)  decreased light absorption 
C)  increased CO2 absorption 
D)  decreased transpiration 
A)  thick leaves 
B)  decreased light absorption 
C)  increased CO2 absorption 
D)  decreased transpiration

Question 9

Which process provides the main force driving water within xylem vessels?

Accepted Answer

A)  active transport of ions into the stele 
B)  evaporation of water through stoma 
C)  the force of root pressure 
D)  osmosis in the root 
A)  active transport of ions into the stele 
B)  evaporation of water through stoma 
C)  the force of root pressure 
D)  osmosis in the root

Question 10

Which of the following observations provides the strongest evidence against root pressure being the principal mechanism of water transport in the xylem?

Accepted Answer

A)  Not all soils have high concentrations of ions. 
B)  Root pressure requires movement of water into the xylem from surrounding cells in the roots. 
C)  Over long distances, the force of root pressure is not enough to overcome the force of gravity. 
D)  There is no water potential gradient between roots and shoots. 
A)  Not all soils have high concentrations of ions. 
B)  Root pressure requires movement of water into the xylem from surrounding cells in the roots. 
C)  Over long distances, the force of root pressure is not enough to overcome the force of gravity. 
D)  There is no water potential gradient between roots and shoots.

Question 11

Which of the following primarily enters a plant somewhere other than through the roots?

Accepted Answer

A)  carbon dioxide 
B)  nitrogen 
C)  potassium 
D)  water 
A)  carbon dioxide 
B)  nitrogen 
C)  potassium 
D)  water

Question 12

Which of the following describes the transmembrane route for transport within plant tissue?

Accepted Answer

A)  water and solutes move out of one cell, across the cell wall, and into the neighboring cell 
B)  water and solutes move out of one cell, through the plasmodesmata, and into the neighboring cell 
C)  water moves out of one cell, across the cell wall, and into the neighboring cell 
D)  solutes move out of one cell, across the plasmodesmata, and into the neighboring cell 
A)  water and solutes move out of one cell, across the cell wall, and into the neighboring cell 
B)  water and solutes move out of one cell, through the plasmodesmata, and into the neighboring cell 
C)  water moves out of one cell, across the cell wall, and into the neighboring cell 
D)  solutes move out of one cell, across the plasmodesmata, and into the neighboring cell

Question 13

Which of the following is a correct statement about sugar movement in phloem?

Accepted Answer

A)  Diffusion can account for the observed rates of transport. 
B)  Movement can occur both upward and downward in the plant. 
C)  Sugar is translocated from sinks to sources. 
D)  Only phloem cells with nuclei can perform sugar movement. 
A)  Diffusion can account for the observed rates of transport. 
B)  Movement can occur both upward and downward in the plant. 
C)  Sugar is translocated from sinks to sources. 
D)  Only phloem cells with nuclei can perform sugar movement.

Exam 36: Transport in Vascular Plants

Which of the following accurately describes the direction phloem sap can flow?

Which of the following describes the Casparian strip in plant roots?

Which structure or compartment is part of the symplast?

Which of the following defines the loss of water from the aerial parts of plants?

Which of the following structures or molecules are required for active transport of amino acids in plants?

When an animal cell is placed in a hypotonic solution and water enters the cell via osmosis, the volume of the cell increases until it bursts. Which of the following explains why this does not happen to plant cells?

If a water molecule in a plant did "circulate" (that is, go from one point in a plant to another and back in the same day), it would require the activity of which of the following?

Which of the following is a result of the high surface-to-volume ratio of leaves?

Which process provides the main force driving water within xylem vessels?

Which of the following observations provides the strongest evidence against root pressure being the principal mechanism of water transport in the xylem?

Which of the following primarily enters a plant somewhere other than through the roots?

Which of the following describes the transmembrane route for transport within plant tissue?

Which of the following is a correct statement about sugar movement in phloem?

Biology and Its Themes

Atoms and Molecules

The Chemistry of Water

Carbon: the Basis of Molecular Diversity

Biological Macromolecules and Lipids

Energy and Life

Cell Structure and Function

Cell Membranes

Cellular Signaling

Cell Respiration

Photosynthetic Processes

Mitosis

Sexual Life Cycles and Meiosis

Mendelian Genetics

Linkage and Chromosomes

Nucleic Acids and Inheritance

Expression of Genes

Control of Gene Expression

Dna Technology

The Evolution of Genomes

How Evolution Works

Phylogenetic Reconstruction

Microevolution

Species and Speciation

Macroevolution

Introduction to Viruses

Prokaryotes

The Origin and Evolution of Eukaryotes

Nonvascular and Seedless Vascular Plants

Seed Plants

Introduction to Fungi

An Introduction to Animal Diversity

Invertebrates

Vertebrates

Plant Structure and Growth

Plant Nutrition

Reproduction of Flowering Plants

Plant Signals and Behavior

The Animal Body

Chemical Signals in Animals

Animal Digestive Systems

Animal Transport Systems

Animal Excretory Systems

Animal Reproductive Systems

Development in Animals

Animal Defenses Against Infection

Electrical Signals in Animals

Neural Regulation in Animals

Sensation and Movement in Animals

An Overview of Ecology

Behavioral Ecology

Populations and Life History Traits

Biodiversity and Communities

Energy Flow and Chemical Cycling in Ecosystems

Conservation and Global Ecology

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