Question 1

In a food web, the average number of feeding links per species, or linkage ________, provides one measure of community complexity.

Accepted Answer

A) richness 
B) diversity 
C) density 
D) number

Question 2

The research of Sally Hacker has demonstrated that Juncus plants are strong antagonists, causing increases in conditions such as salinity that hinder the growth of other plants such as Iva.

Accepted Answer

A) True 
 B)False

Question 3

Explain what an indirect interaction is, and give an example of an indirect interaction that has a strong effect on a specific species in a community.

Accepted Answer

The answer of Explain what an indirect interaction is, and...

Question 4

In a food web diagram, top ________ are species that prey on intermediate and basal species but are not fed upon themselves.

Accepted Answer

The answer of In a food web diagram, top ________...

Question 5

The boundaries between communities are usually sharply defined and easily discerned.

Accepted Answer

A) True 
 B)False

Question 6

It is usually straightforward to determine the species richness of any given community since species richness is simply the number of species in a community.

Accepted Answer

A) True 
 B)False

Question 7

Plant community structure along an environmental gradient can often be explained by

Accepted Answer

A) differences among species in their competitive abilities. 
B) differences among species in their abilities to tolerate stress. 
C) differences among species in their resistance to herbivores. 
D) a trade-off among species with respect to competitive ability and stress tolerance.

Question 8

Species interactions within a community rarely involve only two species.

Accepted Answer

A) True 
 B)False

Question 9

The diversity of an animal community is unrelated to the physical structure of a plant community.

Accepted Answer

A) True 
 B)False

Question 10

When prey populations are controlled by predators in a trophic level above them they are said to be under ________ control.

Accepted Answer

The answer of When prey populations are controlled by predators...

Question 11

Changes in the physical and biological structure of communities as you move across the landscape are referred to as ________.

Accepted Answer

The answer of Changes in the physical and biological structure...

Question 12

Competitive interactions are often diffuse while mutualisms are not.

Accepted Answer

A) True 
 B)False

Question 13

In a forest community, the layer containing tall shrubs, small trees, and young trees is called the ________.

Accepted Answer

The answer of In a forest community, the layer containing...

Question 14

A community refers to the group of species that occupy a given area, interacting either directly or indirectly.

Accepted Answer

A) True 
 B)False

Question 15

Environmental conditions often vary spatially but do not tend to change over time in a given place.

Accepted Answer

A) True 
 B)False

Question 16

A(n)________ model of community structure assumes that interactions among species have no impact on community structure.

Accepted Answer

The answer of A(n)________ model of community structure assumes that...

Question 17

A group of species in a community that all exploit the same common resource is called a

Accepted Answer

A) niche. 
B) guild. 
C) trophic level. 
D) food chain.

Question 18

The removal of a single species from a community can have unpredictable consequences.

Accepted Answer

A) True 
 B)False

Question 19

The benthic zone of a lake is where most of the decomposition takes place.

Accepted Answer

A) True 
 B)False

Question 20

Variation in environmental conditions within a community, or environmental ________, can have a strong influence on the diversity of a community.

Accepted Answer

The answer of Variation in environmental conditions within a community,...

Exam 16: Community Structure

In a food web, the average number of feeding links per species, or linkage ________, provides one measure of community complexity.

The research of Sally Hacker has demonstrated that Juncus plants are strong antagonists, causing increases in conditions such as salinity that hinder the growth of other plants such as Iva.

Explain what an indirect interaction is, and give an example of an indirect interaction that has a strong effect on a specific species in a community.

In a food web diagram, top ________ are species that prey on intermediate and basal species but are not fed upon themselves.

The boundaries between communities are usually sharply defined and easily discerned.

It is usually straightforward to determine the species richness of any given community since species richness is simply the number of species in a community.

Plant community structure along an environmental gradient can often be explained by

Species interactions within a community rarely involve only two species.

The diversity of an animal community is unrelated to the physical structure of a plant community.

When prey populations are controlled by predators in a trophic level above them they are said to be under ________ control.

Changes in the physical and biological structure of communities as you move across the landscape are referred to as ________.

Competitive interactions are often diffuse while mutualisms are not.

In a forest community, the layer containing tall shrubs, small trees, and young trees is called the ________.

A community refers to the group of species that occupy a given area, interacting either directly or indirectly.

Environmental conditions often vary spatially but do not tend to change over time in a given place.

A(n)________ model of community structure assumes that interactions among species have no impact on community structure.

A group of species in a community that all exploit the same common resource is called a

The removal of a single species from a community can have unpredictable consequences.

The benthic zone of a lake is where most of the decomposition takes place.

Variation in environmental conditions within a community, or environmental ________, can have a strong influence on the diversity of a community.