Bio II chapter 41 homework answer

Of the choices below, which best describes the effect predation has on the predator/prey organisms involved in the relationship?

A. benefits / harmed

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

A. ecological niche.

What type of interaction is commensalism?

B. + / 0

Which of the following best illustrates ecological succession?

B. Grass grows on a sand dune, is replaced by shrubs, and then by trees.

In most ecological communities, plants are the first level of the trophic structure, known as producers. What do plants produce that supports the higher trophic levels of the community?

B. energy-containing food molecules

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

B. mutualism.

Which of these is a starting point for primary succession?

C. a surface exposed by a retreating glacier

Humans and sharks both eat fish. Which of the following terms applies to the relationship between the human and the shark?

C. competition

An organism's "trophic level" refers to

C. its food source.

Humans who have pets tend to be healthier than humans who do not have pets. Which of these terms applies to the relationship between a human and a pet?

C. mutualism

A human eats a deer. Which of the following terms applies to the relationship between the human and the deer?

C. predation

In an ecosystem, phytoplankton are

C. producers.

Keystone species are those species

C. whose absence would cause major disruption in a community.

A cow eating grass is an example of a

D. primary consumer.

A hypothetical bat species (species 1) lives in a city. Another hypothetical bat species (species 2) established a population in the same city after a number of individuals escaped from a zoo. In isolation, each species can roost in buildings of any height, but prefers to roost in buildings that are three or more stories tall Roosting areas in buildings of any height are the _____ of species 1. _____ between the two bat species occurs because both species prefer the same roosting areas. In parts of the city with only tall buildings (over two stories), _____ of species 1 may occur. Roosting areas in buildings that are one or two stories tall are the _____ of species 1 when species 2 is present. The change in the roosting habits of species 1 after species 2 became established in the city is an example of _____ . The competition between the species for roosting areas is an example of a _____ interaction. A. - / - B. character displacement C. resource partitioning D. competitive exclusion E. fundamental niche F. intraspecific competition G. interspecific competition H. realized nich

E,G,D,H,C,A

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

E. Batesian mimicry.

Based on the intermediate disturbance hypothesis, a community's species diversity is increased by

E. moderate levels of disturbance.