Question 1

The flow of xylem sap up a plant

Accepted Answer

A)  continues during the night. 
B)  does not vary during the day. 
C)  is driven by root pressure. 
D)  would be slowed by the removal of some of the leaves of the plant. 
E)  requires energy. 
A)  continues during the night. 
B)  does not vary during the day. 
C)  is driven by root pressure. 
D)  would be slowed by the removal of some of the leaves of the plant. 
E)  requires energy.

Question 2

Minerals taken up in their ionic form are moved into root cells against their concentration gradient by the process of _______ transport.

Accepted Answer

The answer of Minerals taken up in their ionic form...

Question 3

Which of the following is part of the apoplast?

Accepted Answer

A)  Cell wall 
B)  Plasma membrane 
C)  Plasmodesma 
D)  Cytoplasm 
E)  Vacuole 
A)  Cell wall 
B)  Plasma membrane 
C)  Plasmodesma 
D)  Cytoplasm 
E)  Vacuole

Question 4

When water moves outside cells, the movement is (regulated/unregulated) _______.

Accepted Answer

The answer of When water moves outside cells, the movement...

Question 5

Most water moving through the apoplast from the soil into the stele cells first crosses a plasma membrane in the cells of the

Accepted Answer

A)  root hairs. 
B)  cortex. 
C)  endodermis. 
D)  pericycle. 
E)  tracheids. 
A)  root hairs. 
B)  cortex. 
C)  endodermis. 
D)  pericycle. 
E)  tracheids.

Question 6

Which of the following statements regarding transport in phloem is true?

Accepted Answer

A)  It always moves in the direction of leaves to roots. 
B)  It proceeds from source tissue to sink tissue. 
C)  It requires no energy inputs from the plant. 
D)  It is the same process as transport in xylem. 
E)  None of the above 
A)  It always moves in the direction of leaves to roots. 
B)  It proceeds from source tissue to sink tissue. 
C)  It requires no energy inputs from the plant. 
D)  It is the same process as transport in xylem. 
E)  None of the above

Question 7

The loading of sucrose into the phloem sieve tube cell in a source tissue

Accepted Answer

A)  is passive. 
B)  is an example of direct active transport. 
C)  occurs by proton-linked secondary active transport. 
D)  is linked to the uptake of K+ into the sieve tube cell. 
E)  results in the loss of water from the sieve tube cell. 
A)  is passive. 
B)  is an example of direct active transport. 
C)  occurs by proton-linked secondary active transport. 
D)  is linked to the uptake of K+ into the sieve tube cell. 
E)  results in the loss of water from the sieve tube cell.

Question 8

Which statement about proton pumping across the plasma membrane of plants is not true?

Accepted Answer

A)  It requires ATP. 
B)  The region inside the membrane becomes positively charged with respect to the region outside. 
C)  It enhances the movement of K+ ions into the cell. 
D)  It pushes protons out of the cell against a proton concentration gradient. 
E)  It can drive the secondary active transport of negatively charged ions. 
A)  It requires ATP. 
B)  The region inside the membrane becomes positively charged with respect to the region outside. 
C)  It enhances the movement of K+ ions into the cell. 
D)  It pushes protons out of the cell against a proton concentration gradient. 
E)  It can drive the secondary active transport of negatively charged ions.

Question 9

The opening of stomata in the light involves _______, and closing in the dark, _______.

Accepted Answer

A)  facilitated diffusion of K+ into guard cells; passive efflux of K+ from guard cells 
B)  the passive uptake of K+ by guard cells; active efflux of K+ from guard cells 
C)  the active uptake of H+ by guard cells; passive efflux of H+ from guard cells 
D)  loss of water from guard cells; uptake of water by guard cells 
E)  Both a and d 
A)  facilitated diffusion of K+ into guard cells; passive efflux of K+ from guard cells 
B)  the passive uptake of K+ by guard cells; active efflux of K+ from guard cells 
C)  the active uptake of H+ by guard cells; passive efflux of H+ from guard cells 
D)  loss of water from guard cells; uptake of water by guard cells 
E)  Both a and d

Question 10

Transport in the xylem is driven 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.

Question 11

Bulk water flow is stopped by

Accepted Answer

A)  metabolic inhibitors. 
B)  closed stomata. 
C)  accumulation of K+. 
D)  blue light. 
E)  surface tension. 
A)  metabolic inhibitors. 
B)  closed stomata. 
C)  accumulation of K+. 
D)  blue light. 
E)  surface tension.

Question 12

Endodermal cells are lined with waxy structures called _______, which prevent water and ions from moving between cells.

Accepted Answer

The answer of Endodermal cells are lined with waxy structures...

Question 13

Osmosis

Accepted Answer

A)  requires ATP. 
B)  results in the bursting of plant cells placed in pure water. 
C)  can cause a cell to become turgid. 
D)  is independent of solute concentrations. 
E)  continues until the pressure potential equals the water potential. 
A)  requires ATP. 
B)  results in the bursting of plant cells placed in pure water. 
C)  can cause a cell to become turgid. 
D)  is independent of solute concentrations. 
E)  continues until the pressure potential equals the water potential.

Question 14

Tension in the xylem is a result of

Accepted Answer

A)  transpiration at the leaf surface. 
B)  the cohesive nature of water. 
C)  the narrowness of the xylem tube. 
D)  the surface area of the phloem. 
E)  All of the above 
A)  transpiration at the leaf surface. 
B)  the cohesive nature of water. 
C)  the narrowness of the xylem tube. 
D)  the surface area of the phloem. 
E)  All of the above

Question 15

The plant hormone _______, which is released when the plant is water-stressed, causes the stomata to close.

Accepted Answer

The answer of The plant hormone _______, which is released...

Question 16

If the pressure potential of a plant's cells is 0.16 megapascals (MPa) and the solute potential is -0.24 MPa, then the water potential would be

Accepted Answer

A)  0.04 MPa. 
B)  0.08 MPa. 
C)  -0.08 MPa. 
D)  -0.24 MPa. 
E)  -0.04 MPa. 
A)  0.04 MPa. 
B)  0.08 MPa. 
C)  -0.08 MPa. 
D)  -0.24 MPa. 
E)  -0.04 MPa.

Question 17

Use the following to answer questions :
Refer to the diagram below, depicting vascular tissue of a stem.  
-Is bulk flow occurring in the phloem only, in the xylem only, or in both?

Accepted Answer

In both th

Question 18

Which technique allowed researchers to conclude that the fibrous proteins in sieve tube elements are normally dispersed and obstruct sieve plates only in response to cell damage?

Accepted Answer

A)  Analyzing phloem sap extruded from aphid stylets 
B)  Freezing phloem tissue before cutting and examining it 
C)  Watering a plant before cutting and examining it 
D)  Using patch clamping to examine sieve plates 
E)  Exposing plants to blue light before examination 
A)  Analyzing phloem sap extruded from aphid stylets 
B)  Freezing phloem tissue before cutting and examining it 
C)  Watering a plant before cutting and examining it 
D)  Using patch clamping to examine sieve plates 
E)  Exposing plants to blue light before examination

Question 19

Under what conditions does transpiration occur most rapidly? What effect does increased transpiration have on water flow in a plant? What happens if adequate water for the plant is not available?

Accepted Answer

Transpiration occurs most rapidly in hig

Question 20

Water is lost through pores in the leaf called _______.

Accepted Answer

The answer of Water is lost through pores in the...

Exam 35: Transport in Plants

The flow of xylem sap up a plant

Minerals taken up in their ionic form are moved into root cells against their concentration gradient by the process of _______ transport.

Which of the following is part of the apoplast?

When water moves outside cells, the movement is (regulated/unregulated) _______.

Most water moving through the apoplast from the soil into the stele cells first crosses a plasma membrane in the cells of the

Which of the following statements regarding transport in phloem is true?

The loading of sucrose into the phloem sieve tube cell in a source tissue

Which statement about proton pumping across the plasma membrane of plants is not true?

The opening of stomata in the light involves _______, and closing in the dark, _______.

Transport in the xylem is driven by

Bulk water flow is stopped by

Endodermal cells are lined with waxy structures called _______, which prevent water and ions from moving between cells.

Osmosis

Tension in the xylem is a result of

The plant hormone _______, which is released when the plant is water-stressed, causes the stomata to close.

If the pressure potential of a plant's cells is 0.16 megapascals (MPa) and the solute potential is -0.24 MPa, then the water potential would be

Use the following to answer questions : Refer to the diagram below, depicting vascular tissue of a stem. -Is bulk flow occurring in the phloem only, in the xylem only, or in both?

Which technique allowed researchers to conclude that the fibrous proteins in sieve tube elements are normally dispersed and obstruct sieve plates only in response to cell damage?

Under what conditions does transpiration occur most rapidly? What effect does increased transpiration have on water flow in a plant? What happens if adequate water for the plant is not available?

Water is lost through pores in the leaf called _______.

Studying Life

Small Molecules and the Chemistry of Life

Proteins, Carbohydrates, and Lipids

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

Cell Membranes

Cell Signaling and Communication

Energy, Enzymes, and Metabolism

Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

Regulation of Gene Expression

Genomes

Recombinent Dna and Biotechnology

Differential Gene Expression in Development

Development and Evolutionary Change

Evidence and Mechanisms of Evolution

Reconstructing and Using Phylogenies

Species and Their Formation

Evolution of Genes and Genomes

The History of Life on Earth

Bacteria and Archaea: the Prokaryotic Domains

The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

Fungi: Recyclers, Pathogens, Parasites, and Plant Partners

Animal Origins and the Evolution of Body Plans

Protostome Animals

Deuterostome Animals

The Plant Body

Plant Nutrition

Regulation of Plant Growth

Reproduction in Flowering Plants

Plant Responses to Environmental Challenges

Physiology, Homeostasis, and Temperature Regulation

Animal Hormones

Immunology: Animal Defense Systems

Animal Reproduction

Animal Development

Neurons and Nervous Systems

Sensory Systems

The Mammalian Nervous System: Structure and Higher Function

Musculoskeletal Systems

Gas Exchange in Animals

Circulatory Systems

Nutrition, Digestion, and Absorption

Salt and Water Balance and Nitrogen

Animal Behavior

Ecology and the Distribution of Life

Population Ecology

Species Interaction and Coevolution

Community Ecology

Ecosystems and Global Ecology

Conservation Biology

Filters

The opening of stomata in the light involves _, and closing in the dark, _.