Question 1

The plant hormone ________ causes stomatal closures in drought stress conditions.

Accepted Answer

A)  indole-3-acetic acid 
B)  gibberellin 
C)  abscisic acid (AB
A)  
D)  ethylene 
A)  indole-3-acetic acid 
B)  gibberellin 
C)  abscisic acid (AB
A)  
D)  ethylene

Question 2

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 3

Plants do not have a circulatory system like that of some animals. 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 ________.

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 4

Which of following ions play the primary role in basic transport processes in plant cells?

Accepted Answer

A)  H⁺ 
B)  Na⁺ 
C)  K⁺ 
D)  Ca⁺² 
A)  H⁺ 
B)  Na⁺ 
C)  K⁺ 
D)  Ca⁺²

Question 5

Which of the following contribute to the surface area available for water absorption from the soil by a plant root system?
I. root hairs
II. endodermis
III. mycorrhizae
IV. fibrous arrangement of the roots

Accepted Answer

A)  II and III 
B)  I, III, and IV 
C)  I, II, and IV 
D)  I, II, III, and IV 
A)  II and III 
B)  I, III, and IV 
C)  I, II, and IV 
D)  I, II, III, and IV

Question 6

Movement of phloem sap from a source to a sink

Accepted Answer

A)  occurs through the apoplast of sieve-tube elements. 
B)  depends ultimately on the activity of proton pumps. 
C)  depends on tension, or negative pressure potential. 
D)  results mainly from diffusion. 
A)  occurs through the apoplast of sieve-tube elements. 
B)  depends ultimately on the activity of proton pumps. 
C)  depends on tension, or negative pressure potential. 
D)  results mainly from diffusion.

Question 7

Which of the following are important components of the long-distance transport process in plants?
I. the cohesion of water molecules
II. a negative water potential
III. the root parenchyma
IV. the active transport of solutes
V. bulk flow from source to sink

Accepted Answer

A)  II, III, IV, and V 
B)  I, III, IV, and V 
C)  I, II, IV, and V 
D)  I, II, III, and V 
A)  II, III, IV, and V 
B)  I, III, IV, and V 
C)  I, II, IV, and V 
D)  I, II, III, and V

Question 8

Transpiration in plants requires ________.
I. adhesion of water molecules to cellulose
II. cohesion between water molecules
III. evaporation of water molecules
IV. active transport through xylem cells
V. transport through tracheids

Accepted Answer

A)  I, III, IV, and V 
B)  I, II, IV, and V 
C)  I, II, III, and V 
D)  I, II, III, and IV 
A)  I, III, IV, and V 
B)  I, II, IV, and V 
C)  I, II, III, and V 
D)  I, II, III, and IV

Question 9

Which one of the following played a critical role in the successful colonisation of land by plants?

Accepted Answer

A)  ground tissue 
B)  bacterial association 
C)  mycorrhizae 
D)  cuticle on leaf surface 
A)  ground tissue 
B)  bacterial association 
C)  mycorrhizae 
D)  cuticle on leaf surface

Question 10

What is the function of proton pumps localised in the plant plasma membrane?

Accepted Answer

A)  to transfer phosphorus groups from ATP to proteins 
B)  to transfer metal ions across the plasma membrane 
C)  to transfer anions across the plasma membrane 
D)  to create a membrane potential 
A)  to transfer phosphorus groups from ATP to proteins 
B)  to transfer metal ions across the plasma membrane 
C)  to transfer anions across the plasma membrane 
D)  to create a membrane potential

Question 11

Which of the following is a net sugar source for a deciduous angiosperm tree?

Accepted Answer

A)  new leaves in early spring 
B)  fruits in summer 
C)  roots in early spring 
D)  roots in early autumn 
A)  new leaves in early spring 
B)  fruits in summer 
C)  roots in early spring 
D)  roots in early autumn

Question 12

Several tomato plants are growing in a small garden plot. If soil water potential were to drop significantly on a hot, summer afternoon, which of the following would most likely occur?

Accepted Answer

A)  Size of stomatal openings would decrease. 
B)  Transpiration would increase. 
C)  The leaves would become more turgid. 
D)  The uptake of carbon dioxide would be enhanced. 
A)  Size of stomatal openings would decrease. 
B)  Transpiration would increase. 
C)  The leaves would become more turgid. 
D)  The uptake of carbon dioxide would be enhanced.

Question 13

Most of the water taken up by a plant is ________.

Accepted Answer

A)  used as a solvent 
B)  used as a hydrogen source in photosynthesis 
C)  lost during transpiration 
D)  used to keep cells turgid 
A)  used as a solvent 
B)  used as a hydrogen source in photosynthesis 
C)  lost during transpiration 
D)  used to keep cells turgid

Question 14

Compared to a cell with few aquaporins in its membrane, a cell containing many aquaporins will ________.

Accepted Answer

A)  have a faster rate of osmosis 
B)  have a lower water potential 
C)  have a higher water potential 
D)  have a faster rate of active transport 
A)  have a faster rate of osmosis 
B)  have a lower water potential 
C)  have a higher water potential 
D)  have a faster rate of active transport

Question 15

If ΨP = 0.3 MPa and ΨS = -0.45 MPa, the resulting Ψ is ________.

Accepted Answer

A)  +0.75 MPa 
B)  -0.75 MPa 
C)  -0.15 MPa 
D)  +0.15 MPa 
A)  +0.75 MPa 
B)  -0.75 MPa 
C)  -0.15 MPa 
D)  +0.15 MPa

Question 16

If you place flaccid plant cells in pure water, water ________ into cell because it has ________.

Accepted Answer

A)  does not enter the cell; solutes and low water potential 
B)  enter the cell; solutes and low water potential 
C)  enter the cell; solutes and high water potential 
D)  does not enter the cell; solutes and high water potential 
A)  does not enter the cell; solutes and low water potential 
B)  enter the cell; solutes and low water potential 
C)  enter the cell; solutes and high water potential 
D)  does not enter the cell; solutes and high water potential

Question 17

What is the overall charge on the cytoplasmic side of a plant cell plasma membrane?

Accepted Answer

A)  positive 
B)  negative 
C)  neutral 
A)  positive 
B)  negative 
C)  neutral

Question 18

Photosynthesis ceases when leaves wilt, mainly because

Accepted Answer

A)  the chlorophyll in wilting leaves is degraded. 
B)  accumulation of CO₂ in the leaf inhibits enzymes. 
C)  stomata close, preventing CO₂ from entering the leaf. 
D)  photolysis, the water-splitting step of photosynthesis, cannot occur when there is a water deficiency. 
A)  the chlorophyll in wilting leaves is degraded. 
B)  accumulation of CO₂ in the leaf inhibits enzymes. 
C)  stomata close, preventing CO₂ from entering the leaf. 
D)  photolysis, the water-splitting step of photosynthesis, cannot occur when there is a water deficiency.

Question 19

Which one of the following ions plays a critical role in the opening and closing of stomata?

Accepted Answer

A)  H⁺ 
B)  Na⁺ 
C)  K⁺ 
D)  Ca⁺² 
A)  H⁺ 
B)  Na⁺ 
C)  K⁺ 
D)  Ca⁺²

Question 20

In the pressure-flow mechanism, loading of sucrose from companion cells to sieve-tube elements takes place through ________.

Accepted Answer

A)  plasmodesmata 
B)  facilitated diffusion 
C)  sucrose-H⁺ symporters 
D)  sucrose-H⁺ antiporters 
A)  plasmodesmata 
B)  facilitated diffusion 
C)  sucrose-H⁺ symporters 
D)  sucrose-H⁺ antiporters

Exam 36: Resource Acquisition and Transport in Vascular Plants

The plant hormone ________ causes stomatal closures in drought stress conditions.

Which structure or compartment is part of the symplast?

Plants do not have a circulatory system like that of some animals. 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 following ions play the primary role in basic transport processes in plant cells?

Which of the following contribute to the surface area available for water absorption from the soil by a plant root system? I. root hairs II. endodermis III. mycorrhizae IV. fibrous arrangement of the roots

Movement of phloem sap from a source to a sink

Which of the following are important components of the long-distance transport process in plants? I. the cohesion of water molecules II. a negative water potential III. the root parenchyma IV. the active transport of solutes V. bulk flow from source to sink

Transpiration in plants requires ________. I. adhesion of water molecules to cellulose II. cohesion between water molecules III. evaporation of water molecules IV. active transport through xylem cells V. transport through tracheids

Which one of the following played a critical role in the successful colonisation of land by plants?

What is the function of proton pumps localised in the plant plasma membrane?

Which of the following is a net sugar source for a deciduous angiosperm tree?

Several tomato plants are growing in a small garden plot. If soil water potential were to drop significantly on a hot, summer afternoon, which of the following would most likely occur?

Most of the water taken up by a plant is ________.

Compared to a cell with few aquaporins in its membrane, a cell containing many aquaporins will ________.

If ΨP = 0.3 MPa and ΨS = -0.45 MPa, the resulting Ψ is ________.

If you place flaccid plant cells in pure water, water ________ into cell because it has ________.

What is the overall charge on the cytoplasmic side of a plant cell plasma membrane?

Photosynthesis ceases when leaves wilt, mainly because

Which one of the following ions plays a critical role in the opening and closing of stomata?

In the pressure-flow mechanism, loading of sucrose from companion cells to sieve-tube elements takes place through ________.

Evolution, the Themes of Biology, and Scientific Inquiry

The Chemical Context of Life

Water and Life

Carbon and the Molecular Diversity of Life

The Structure and Function of Large Biological Molecules

A Tour of the Cell

Membrane Structure and Function

An Introduction to Metabolism

Cellular Respiration and Fermentation

Photosynthesis

Cell Communication

The Cell Cycle

Meiosis and Sexual Life Cycles

Mendel and the Gene Idea

The Chromosomal Basis of Inheritance

The Molecular Basis of Inheritance

Gene Expression: From Gene to Protein

Regulation of Gene Expression

Viruses

Dna Tools and Biotechnology

Genomes and Their Evolution

Descent With Modification: a Darwinian View of Life

The Evolution of Populations

The Origin of Species

The History of Life on Earth

Phylogeny and the Tree of Life

Bacteria and Archaea

Protists

Plant Diversity I: How Plants Colonised Land

Plant Diversity Ii: the Evolution of Seed Plants

Fungi

An Overview of Animal Diversity

An Introduction to Invertebrates

The Origin and Evolution of Vertebrates

Vascular Plant Structure, Growth, and Development

Soil and Plant Nutrition

Angiosperm Reproduction and Biotechnology

Plant Responses to Internal and External Signals

Basic Principles of Animal Form and Function

Animal Nutrition

Circulation and Gas Exchange

The Immune System

Osmoregulation and Excretion

Hormones and the Endocrine System

Animal Reproduction

Animal Development

Neurons, Synapses, and Signalling

Nervous Systems

Sensory and Motor Mechanisms

Filters

If Ψ_P = 0.3 MPa and Ψ_S = -0.45 MPa, the resulting Ψ is ________.

If you place flaccid plant cells in pure water, water into cell because it has .