Question 1 Select one answer. 10 points Species richness is The number of specie

Question

Question 1

Select one answer.

10 points

Species richness is

The number of species in a population

The number of different species in an area

The total weight, or biomass, of living organisms in a given area

The number of organisms in a community

Question 2

Select one answer.

10 points

Occasionally American alligators are sighted in rivers or lakes in New York City, far north of their usual range. These alligators are usually escaped pets. There is no self-sustaining population of alligators in New York, and they have no important influence on other populations there. Is the American alligator a member of the ecological community in New York?

No

Yes

Question 3

Select one answer.

10 points

By damming streams, American beavers produce swamp, open marsh, and pond habitats that would not otherwise exist. Ecologists have compared the species diversity in regions with and without beaver populations. If the beaver is a keystone species, what do you think they found?

Species diversity was higher in areas with beaver.

Beaver did not influence the diversity of other species.

Species diversity was higher in areas without beaver.

Question 4

Select one answer.

10 points

Which of the following is an indirect interspecific interaction?

Big fish eat small fish.

Small fish eat swimming crustaceans called zooplankton.

Zooplankton eat (graze) floating algae called phytoplankton.

Large fish reduce the abundance of phytoplankton. This occurs because large fish eat small fish, which leads to greater zooplankton numbers. The zooplankton grazing then reduces phytoplankton abundance.

Individual pike (large fish) compete with each other for feeding territories.

Question 5

Select one answer.

10 points

In Africa, grasses are the main vegetation in savanna communities. Acacias and other trees are few and widely scattered. Elephants range over very large territories and are not very abundant in any one location. However, they strongly affect the community by uprooting and consuming trees and shrubs, maintaining suitable habitat for grasses and grassland animals. Many species of birds and insects live in the savanna grasses. Which of the species or groups above would best be described as foundation species?

acacia trees

birds and insects

elephants

grasses

Question 6

Select all that apply.

10 points

Which of the following are examples of symbiosis? Select all that apply.

Head lice complete an entire life cycle within a person

Explanation / Answer

The number of different species in an area.

No. Ecological community refers to group of potentially interacting species living in a same place.

Species diversity was higher in areas with beaver.

Large fish reduce the abundance of phytoplankton. This occurs because large fish eat small fish, which leads to greater zooplankton numbers. The zooplankton grazing then reduces phytoplankton abundance.

Elephants. Foundation species are referred to as

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