Question 1

Explain why a dry, hot, breezy day can result in the leaves of certain plants having to completely replace their water each hour.

Accepted Answer

The lower the relative humidity, the lower (more negative the water potential in the atmosphere. A hot day will speed evaporation at the leaf surface. Air moving across a leaf surface carries water vapor away.

Question 2

An ant that consumes the "honeydew" from an aphid's anus benefits by obtaining a source of carbon.

Accepted Answer

A) True 
 B)False  True

Question 3

The living portion of the pathway through which water travels through a root is called the apoplastic pathway.

Accepted Answer

A) True 
 B)False  False

Question 4

According to the cohesion-tension mechanism of water transport, ____ does not contribute to the flow of the xylem sap?

Accepted Answer

A) hydrogen bonding between water molecules ​ 
B) adhesion of water molecules to the xylem vessel walls 
C) evaporation of water from the leaves 
D) water potential in leaf cells below that of the leaf xylem 
E) root pressure 
A) hydrogen bonding between water molecules ​ 
B) adhesion of water molecules to the xylem vessel walls 
C) evaporation of water from the leaves 
D) water potential in leaf cells below that of the leaf xylem 
E) root pressure

Question 5

Water potential, the inherent capacity of water molecules to move from one site to another when conditions dictate, is typically represented by the Greek letter ____.

Accepted Answer

A) a ​ 
B) g 
C) y 
D) p 
E) q 
A) a ​ 
B) g 
C) y 
D) p 
E) q

Question 6

The major cost to plants for having cuticle-covered epidermis in the shoot system to reduce water loss is reduced ____ uptake.

Accepted Answer

A) carbon dioxide 
B) potassium 
C) nitrogen 
D) calcium 
E) oxygen 
A) carbon dioxide 
B) potassium 
C) nitrogen 
D) calcium 
E) oxygen

Question 7

In phloem movement, ____ does not serve as a source.

Accepted Answer

A) photosynthesizing cells in a leaf 
B) roots 
C) photosynthesizing cells in a stem 
D) food storage cells in a stem 
E) soil 
A) photosynthesizing cells in a leaf 
B) roots 
C) photosynthesizing cells in a stem 
D) food storage cells in a stem 
E) soil

Question 8

Phloem sap does not normally contain ____.

Accepted Answer

A) carbohydrates ​ 
B) hormones 
C) water 
D) amino acids 
E) nitrate 
A) carbohydrates ​ 
B) hormones 
C) water 
D) amino acids 
E) nitrate

Question 9

Root epidermal cells passively transport ions inward from the soil because the ions are unable to follow a concentration gradient into the cells.

Accepted Answer

A) True 
 B)False

Question 10

Individual plant cells typically gain or lose water mainly via ____.

Accepted Answer

A) facilitated diffusion 
B) symport 
C) guttation 
D) osmosis 
E) bulk flow 
A) facilitated diffusion 
B) symport 
C) guttation 
D) osmosis 
E) bulk flow

Question 11

Approximately ____ percent of water that enters a plant's roots is used for photosynthesis and other parts of metabolism and growth.

Accepted Answer

A) 1-3 
B) 2-5 
C) 5-10 
D) 15-20 
E) 25-30 
A) 1-3 
B) 2-5 
C) 5-10 
D) 15-20 
E) 25-30

Question 12

In phloem movement, ____ cannot serve as a sink.

Accepted Answer

A) young leaves 
B) young roots 
C) developing fruits 
D) tulip bulbs after the plant has bloomed 
E) soil 
A) young leaves 
B) young roots 
C) developing fruits 
D) tulip bulbs after the plant has bloomed 
E) soil

Question 13

Water can move inside a root via the ____.

Accepted Answer

A) symplastic pathway only ​ 
B) transmembrane and symplastic pathways 
C) transmembrane pathway only 
D) apoplastic, transmembrane, and symplastic pathways 
E) apoplastic pathway only 
A) symplastic pathway only ​ 
B) transmembrane and symplastic pathways 
C) transmembrane pathway only 
D) apoplastic, transmembrane, and symplastic pathways 
E) apoplastic pathway only

Question 14

Describe how NO3-is transported into a plant cell.

Accepted Answer

Both of these ions are transferred by se

Question 15

What is the y  P  of a living plant cell that has y = - 0.2 MPa and y  S  = - 0.4 MPa?

Accepted Answer

A) y  P  = - 0.6 MPa 
B) y  P  = 0.08 MPa 
C) y  P  = - 0.2 MPa 
D) y  P  = 0.2 MPa 
E) y  P  = 0.5 MPa 
A) y  P  = - 0.6 MPa 
B) y  P  = 0.08 MPa 
C) y  P  = - 0.2 MPa 
D) y  P  = 0.2 MPa 
E) y  P  = 0.5 MPa

Question 16

The most widely accepted and supported model that explains the movement of phloem sap in flowering plants is the ____ mechanism.

Accepted Answer

A) cohesion-tension 
B) translocation 
C) pressure flow 
D) osmosis 
E) transpiration 
A) cohesion-tension 
B) translocation 
C) pressure flow 
D) osmosis 
E) transpiration

Question 17

Which factor has little effect on the rate of transpiration?

Accepted Answer

A) air temperature 
B) relative humidity 
C) air movement 
D) the amount of direct solar radiation 
E) daily fluctuations in atmospheric carbon dioxide concentrations 
A) air temperature 
B) relative humidity 
C) air movement 
D) the amount of direct solar radiation 
E) daily fluctuations in atmospheric carbon dioxide concentrations

Question 18

Leaves on the lower part of a bush primarily feed the ____.

Accepted Answer

A) roots 
B) leaf tips 
C) stems 
D) upper leaves 
E) flowers 
A) roots 
B) leaf tips 
C) stems 
D) upper leaves 
E) flowers

Question 19

Match between columns
                        Premises: Xylem

Accepted Answer

The Answer of  G and  B and  is...

Question 20

The hypothesis that high pressure forces phloem sap to flow was tested and supported by studies using ____.

Accepted Answer

A) caterpillars 
B) radiolabeled hormones 
C) vacuum chambers 
D) aphids 
E) radiolabeled sugars 
A) caterpillars 
B) radiolabeled hormones 
C) vacuum chambers 
D) aphids 
E) radiolabeled sugars

Exam 34: Transport in Plants

Explain why a dry, hot, breezy day can result in the leaves of certain plants having to completely replace their water each hour.

An ant that consumes the "honeydew" from an aphid's anus benefits by obtaining a source of carbon.

The living portion of the pathway through which water travels through a root is called the apoplastic pathway.

According to the cohesion-tension mechanism of water transport, ____ does not contribute to the flow of the xylem sap?

Water potential, the inherent capacity of water molecules to move from one site to another when conditions dictate, is typically represented by the Greek letter ____.

The major cost to plants for having cuticle-covered epidermis in the shoot system to reduce water loss is reduced ____ uptake.

In phloem movement, ____ does not serve as a source.

Phloem sap does not normally contain ____.

Root epidermal cells passively transport ions inward from the soil because the ions are unable to follow a concentration gradient into the cells.

Individual plant cells typically gain or lose water mainly via ____.

Approximately ____ percent of water that enters a plant's roots is used for photosynthesis and other parts of metabolism and growth.

In phloem movement, ____ cannot serve as a sink.

Water can move inside a root via the ____.

Describe how NO3-is transported into a plant cell.

What is the y P of a living plant cell that has y = - 0.2 MPa and y S = - 0.4 MPa?

The most widely accepted and supported model that explains the movement of phloem sap in flowering plants is the ____ mechanism.

Which factor has little effect on the rate of transpiration?

Leaves on the lower part of a bush primarily feed the ____.

The hypothesis that high pressure forces phloem sap to flow was tested and supported by studies using ____.

Introduction to Biological Concepts and Research

Life, Chemistry, and Water

Biological Molecules: the Carbon Compounds of Life

Cells

Membranes and Transport

Energy, Enzymes, and Biological Reactions

Cellular Respiration: Harvesting Chemical Energy

Photosynthesis

Cell Communication

Cell Division and Mitosis

Meiosis: the Cellular Basis of Sexual Reproduction

Mendel, Genes, and Inheritance

Genes, Chromosomes, and Human Genetics

DNA Structure, Replication, and Organization

From DNA to Protein

Regulation of Gene Expression

Bacterial and Viral Genetics

Dna Technologies: Making and Using Genetically Altered Organisms, and Other Applications

Genomes and Proteomes

The Development of Evolutionary Thought

Microevolution: Genetic Changes Within Populations

Speciation

Paleobiology and Macroevolution

Systematic Biology: Phylogeny and Classification

The Origin of Life

Prokaryotes and Viruses

Protists

Seedless Plants

Seed Plants

Fungi

Animal Phylogeny, Acoelomates, and Protostomes

Deuterostomes: Vertebrates and Their Closest Relatives

The Plant Body

Plant Nutrition

Reproduction and Development in Flowering Plants

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Information Flow and the Neuron

Nervous Systems

Sensory Systems

The Endocrine System

Muscles, Bones, and Body Movements

The Circulatory System

Defenses Against Disease

Gas Exchange: the Respiratory System

Animal Nutrition

Regulating the Internal Environment

Animal Reproduction

Animal Development

Ecology and the Biosphere

Population Ecology

Population Interactions and Community Ecology

Ecosystems

Biodiversity and Conservation Biology

Animal Behavior

Filters

Describe how NO₃^-is transported into a plant cell.

What is the y _P of a living plant cell that has y = - 0.2 MPa and y _S = - 0.4 MPa?