Bio Ch53 Pretest

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According to the principle of competitive exclusion, two species cannot continue to occupy the same _____.

ecological niche

Which answer below describes the effect predation has on the organisms involved in the relationship?

benefit; harmed

The term used to describe a harmless organism resembling a harmful one is _____.

Batesian mimicry

Cellulose-digesting microorganisms live in the guts of termites and ruminant mammals. The microorganisms have a home and food, while their hosts gain more nutrition from their meals. This relationship is an example of _____.

mutualism
( The cellulose-digesting microorganisms have a home and place to live; the hosts get nutrients from the microorganism's breakdown of cellulose.)

Which statement about coevolution is NOT true?

A possible example of coevolution is the aposematic coloration of tree frogs and the adverse reactions of various predators.

An organism's "trophic level" refers to _____.

its food source

Keystone species are those species _____.

whose absence would cause major disruption in an ecosystem
( A keystone species makes an unusually strong impact on community structure.)

Which of the following best illustrates ecological succession?

Grass grows on a sand dune, followed by shrubs, and then trees.

According to MacArthur and Wilson's hypothesis of island biogeography, species immigration and extinction rates on a particular island correlate to _____.

the island's size and distance from the mainland
( The American ecologists predicted that species immigration and extinction rates correlate to the size of an island and its distance from the mainland.)

The idea that the destruction of one species in a community could greatly affect other members of the community has its roots in the _____ of community structure, which reiterates the_____ of almost 100 years ago.

rivet model ... integrated hypothesis of community structure
( In the integrated hypothesis, Clements proposed that community members were closely linked and functioned almost as a superorganism. Ehrlich's rivet model is based on an airplane analogy, in which the gradual removal of rivets could eventually spell disaster for the plane.)

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