Question 1

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. 
E) be flaccid. 
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. 
E) be flaccid.

Question 2

Guard cells are the only cells in the epidermis that contain chloroplasts and can undergo photosynthesis. This is important because

Accepted Answer

A) chloroplasts sense when light is available so that guard cells will open. 
B) photosynthesis provides the energy necessary for contractile proteins to flex and open the guard cells. 
C) guard cells will produce the O₂ necessary to power active transport. 
D) ATP is required to power proton pumps in the guard cell membranes. 
E) chloroplasts sense when light is available so that guard cells will open and guard cells will produce the O₂ necessary to power active transport. 
A) chloroplasts sense when light is available so that guard cells will open. 
B) photosynthesis provides the energy necessary for contractile proteins to flex and open the guard cells. 
C) guard cells will produce the O₂ necessary to power active transport. 
D) ATP is required to power proton pumps in the guard cell membranes. 
E) chloroplasts sense when light is available so that guard cells will open and guard cells will produce the O₂ necessary to power active transport.

Question 3

Which of the following would tend to increase transpiration?

Accepted Answer

A) a rainstorm 
B) sunken stomata 
C) a thicker cuticle 
D) higher stomatal density 
E) spiny leaves 
A) a rainstorm 
B) sunken stomata 
C) a thicker cuticle 
D) higher stomatal density 
E) spiny leaves

Question 4

The following factors may sometimes play a role in the movement of sap through xylem. Which one depends on the direct expenditure of ATP by the plant?

Accepted Answer

A) capillarity of water within the xylem 
B) evaporation of water from leaves 
C) cohesion among water molecules 
D) concentration of ions in the symplast 
E) bulk flow of water in the root apoplast 
A) capillarity of water within the xylem 
B) evaporation of water from leaves 
C) cohesion among water molecules 
D) concentration of ions in the symplast 
E) bulk flow of water in the root apoplast

Question 5

Photosynthesis begins to decline when leaves wilt because

Accepted Answer

A) chloroplasts within wilted leaves are incapable of photosynthesis. 
B) CO₂ accumulates in the leaves and inhibits the enzymes needed for photosynthesis. 
C) there is insufficient water for photolysis during the light reactions. 
D) stomata close, restricting CO₂ entry into the leaf. 
E) wilted leaves cannot absorb the red and blue wavelengths of light. 
A) chloroplasts within wilted leaves are incapable of photosynthesis. 
B) CO₂ accumulates in the leaves and inhibits the enzymes needed for photosynthesis. 
C) there is insufficient water for photolysis during the light reactions. 
D) stomata close, restricting CO₂ entry into the leaf. 
E) wilted leaves cannot absorb the red and blue wavelengths of light.

Question 6

The movement of water across biological membranes can best be predicted by

Accepted Answer

A) negative charges in the cell wall. 
B) prevailing weather conditions. 
C) aquaporins. 
D) level of active transport. 
E) water potential. 
A) negative charges in the cell wall. 
B) prevailing weather conditions. 
C) aquaporins. 
D) level of active transport. 
E) water potential.

Question 7

Water rises in plants primarily by cohesion-tension. Which of the following is not true about the cohesion-tension model?

Accepted Answer

A) Water loss (transpiration)is the driving force for water movement. 
B) The "tension" of this model represents the excitability of the xylem cells. 
C) Cohesion represents the tendency for water molecules to stick together by hydrogen bonds. 
D) The physical forces in the capillary-sized xylem cells make it easier to overcome gravity. 
E) The water potential of the air is more negative than the xylem. 
A) Water loss (transpiration)is the driving force for water movement. 
B) The "tension" of this model represents the excitability of the xylem cells. 
C) Cohesion represents the tendency for water molecules to stick together by hydrogen bonds. 
D) The physical forces in the capillary-sized xylem cells make it easier to overcome gravity. 
E) The water potential of the air is more negative than the xylem.

Question 8

If isolated plant cells with a water potential averaging -0.5 MPa are placed into a solution with a water potential of -0.3 MPa, which of the following would be the most likely outcome?

Accepted Answer

A) The pressure potential of the cells would increase. 
B) Water would move out of the cells. 
C) The cell walls would rupture, killing the cells. 
D) Solutes would move out of the cells. 
E) The osmotic pressure of the cells would decrease. 
A) The pressure potential of the cells would increase. 
B) Water would move out of the cells. 
C) The cell walls would rupture, killing the cells. 
D) Solutes would move out of the cells. 
E) The osmotic pressure of the cells would decrease.

Question 9

Which one of the following statements about transport of nutrients in phloem is false?

Accepted Answer

A) Solute particles can be actively transported into phloem at the source. 
B) Companion cells control the rate and direction of movement of phloem sap. 
C) Differences in osmotic concentration at the source and sink cause a hydrostatic pressure gradient to be formed. 
D) A sink is that part of the plant where a particular solute is consumed or stored. 
E) A sink may be located anywhere in the plant. 
A) Solute particles can be actively transported into phloem at the source. 
B) Companion cells control the rate and direction of movement of phloem sap. 
C) Differences in osmotic concentration at the source and sink cause a hydrostatic pressure gradient to be formed. 
D) A sink is that part of the plant where a particular solute is consumed or stored. 
E) A sink may be located anywhere in the plant.

Exam 36: Resource Acquisition and Transport in Vascular Plants

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

Guard cells are the only cells in the epidermis that contain chloroplasts and can undergo photosynthesis. This is important because

Which of the following would tend to increase transpiration?

The following factors may sometimes play a role in the movement of sap through xylem. Which one depends on the direct expenditure of ATP by the plant?

Photosynthesis begins to decline when leaves wilt because

The movement of water across biological membranes can best be predicted by

Water rises in plants primarily by cohesion-tension. Which of the following is not true about the cohesion-tension model?

If isolated plant cells with a water potential averaging -0.5 MPa are placed into a solution with a water potential of -0.3 MPa, which of the following would be the most likely outcome?

Which one of the following statements about transport of nutrients in phloem is false?

Introduction: Evolution and Themes of Biology

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

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 Colonized 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

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

Animal Behaviour

An Introduction to Ecology and the Biosphere

Population Ecology

Community Ecology

Ecosystems and Restoration Ecology

Conservation Biology and Global Change

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