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Exam 17: Community Structure

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Question 1

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The layer of a forest in which decomposition takes place and mineral nutrients are released for reuse by plants is called the

A) canopy.
B) understory.
C) herb layer.
D) forest floor.

E) B) and D)
F) A) and C)

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Question 2

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The percentage of individuals in a community that belong to one species is called the relative ________ of that species.

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Question 3

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In a sandy beach community,ghost crabs and beach flies occur within

A(n)________ is a type of community with relatively consistent species composition; a uniform,general appearance; and a distribution that is characteristic of a particular habitat.

The form and structure of terrestrial communities are defined more by the plants than the animals present.

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

When a single or a few species are most prevalent in a community,the species are called ________.

Every community has an associated vertical structure.

When an ecologist compares the diversity of different communities by counting the number of species within each community,the measure of diversity being used is called

Which description is true for most communities?

Some aquatic communities are defined by physical features of the abiotic environment rather than by the dominant organisms.

If a forest canopy is dense and closed,the understory and shrub layers tend to be well developed.

Species composition does not usually differ much within a local area,such as between a hilltop and a stream bottomland.

In a forest community,the upper layer is called the ________.

Within a community,a group of species that carries out similar functions or exploits the same resource is called a(n)________.

Which statement best describes a keystone species?

The species within a guild are unlikely to interact with one another.

In aquatic habitats,the bottom zone where decomposition is most active is referred to as the ________ zone.

________ index (D)represents the probability that two individuals randomly selected from a sample will belong to the same species.

During the summer,the bottom,cold layer of dense water in a well-stratified lake is called the ________.