Question 1

Cattle grazing has a surprisingly harmful affect on dry grassland of the southwestern United States.What aspect of grazing is most likely responsible?

Accepted Answer

A)  Cattle are seed-dispersal mutualists;they gather shrub seeds while grazing and then deposit them in a concentrated area when they defecate. 
B)  Cattle compress the soil;the small amount of rainfall runs off the surface rather than penetrating,and the deep-rooted grasses are replaced by shallow-rooted shrubs. 
C)  Cattle droppings are toxic to the grasses that cattle prefer;eventually,the buildup of toxins permits only toxin-resistant shrubs to grow. 
D)  Grazing exposes the native plants to sunlight,which initially stunts and eventually inhibits their growth. 
A)  Cattle are seed-dispersal mutualists;they gather shrub seeds while grazing and then deposit them in a concentrated area when they defecate. 
B)  Cattle compress the soil;the small amount of rainfall runs off the surface rather than penetrating,and the deep-rooted grasses are replaced by shallow-rooted shrubs. 
C)  Cattle droppings are toxic to the grasses that cattle prefer;eventually,the buildup of toxins permits only toxin-resistant shrubs to grow. 
D)  Grazing exposes the native plants to sunlight,which initially stunts and eventually inhibits their growth.

Question 2

Secondary succession is more likely to follow a disturbance to a mature community than primary succession because ________ typically remain intact.

Accepted Answer

The answer of Secondary succession is more likely to follow...

Question 3

Which of the following statements about human-caused disturbances to communities is true?

Accepted Answer

A)  Human-caused disturbances are not important because they do not cause any long-term permanent changes. 
B)  When a community recovers from a human-caused disturbance,it returns to its pre-disturbance condition. 
C)  Some communities can recover from human-caused disturbances over a period of time. 
D)  All communities are able to recover from human-caused disturbances. 
A)  Human-caused disturbances are not important because they do not cause any long-term permanent changes. 
B)  When a community recovers from a human-caused disturbance,it returns to its pre-disturbance condition. 
C)  Some communities can recover from human-caused disturbances over a period of time. 
D)  All communities are able to recover from human-caused disturbances.

Question 4

Herbivores interact exploitatively with the plants they consume;do they simultaneously participate in any other relationships within their communities?

Accepted Answer

A)  Yes: an herbivore will have mutualistic relationships with intestinal bacteria and an exploitative relationship with its predators. 
B)  No: community relationships always have costs,so reducing them increases an organism's fitness. 
C)  No: only a single type of interaction can occur at a time,although herbivores can participate in several exploitative relationships at once. 
D)  Yes: each of the plant species eaten needs to be considered a separate interaction. 
A)  Yes: an herbivore will have mutualistic relationships with intestinal bacteria and an exploitative relationship with its predators. 
B)  No: community relationships always have costs,so reducing them increases an organism's fitness. 
C)  No: only a single type of interaction can occur at a time,although herbivores can participate in several exploitative relationships at once. 
D)  Yes: each of the plant species eaten needs to be considered a separate interaction.

Question 5

Every healthy human digestive system is home to countless microorganisms.In a normal digestive system,what type of relationship would you say this is?

Accepted Answer

A)  parasitic 
B)  mutualistic 
C)  competitive 
D)  pathological 
A)  parasitic 
B)  mutualistic 
C)  competitive 
D)  pathological

Cattle grazing has a surprisingly harmful affect on dry grassland of the southwestern United States.What aspect of grazing is most likely responsible?

Secondary succession is more likely to follow a disturbance to a mature community than primary succession because ________ typically remain intact.

Which of the following statements about human-caused disturbances to communities is true?

Herbivores interact exploitatively with the plants they consume;do they simultaneously participate in any other relationships within their communities?

Every healthy human digestive system is home to countless microorganisms.In a normal digestive system,what type of relationship would you say this is?

The Nature of Science and the Characteristics of Life

The Chemistry of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Cancer and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

DNA and Genes

From Gene to Protein

DNA Technology

How Evolution Works

The Origin of Species

The Evolution of Biodiversity

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

The Biosphere

Growth of Populations

Animal Behavior

Ecosystems

Global Change

Internal Organization and Homeostasis

Nutrition and Digestion

Circulation and Gas Exchange

Animal Hormones

Nervous and Sensory Systems

Skeletons,Muscles,and Movement

The Immune System

Reproduction and Development

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

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Exam 23: Ecological Communities

Cattle grazing has a surprisingly harmful affect on dry grassland of the southwestern United States.What aspect of grazing is most likely responsible?

Secondary succession is more likely to follow a disturbance to a mature community than primary succession because ________ typically remain intact.

Which of the following statements about human-caused disturbances to communities is true?

Herbivores interact exploitatively with the plants they consume;do they simultaneously participate in any other relationships within their communities?

Every healthy human digestive system is home to countless microorganisms.In a normal digestive system,what type of relationship would you say this is?

The Nature of Science and the Characteristics of Life

The Chemistry of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Cancer and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

DNA and Genes

From Gene to Protein

DNA Technology

How Evolution Works

The Origin of Species

The Evolution of Biodiversity

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

The Biosphere

Growth of Populations

Animal Behavior

Ecosystems

Global Change

Internal Organization and Homeostasis

Nutrition and Digestion

Circulation and Gas Exchange

Animal Hormones

Nervous and Sensory Systems

Skeletons,Muscles,and Movement

The Immune System

Reproduction and Development

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

Filters