Download Unit 7 practice test

1.) Define the following terms
a. Community
b. Community structure
c. Competition
d. Predation
e. Herbivory
f. Symbiosis
g. Parasitism
h. Mutualism
i.
Commensalism
j.
Competitive Exclusion Principle
k. Ecological Niche
l.
Fundamental Niche
m. Realized Niche
n. Trophic Structure
o. Keystone Species
p. Dominant Species
q. Succession
2.) Describe, step by step, the type of communities that would form after a lava
flow covered an area. What type of succession is this?
3.) Describe the types of communities that would form after a fire swept through
an area. What type of succession is this?
PRACTICE TEST
1.) When needed resources are unevenly distributed, organisms show a(n)
________ dispersion pattern
a. Clumped
b. Random
c. Uniform
d. Exponential
2.) Herring gulls fiercely defend the areas around their nests in breeding
colonies. Within the colony they would show a ______ dispersion pattern.
a. Uniform
b. Random
c. Dense
d. Clumped
3.) The sum of all Earth’s ecosystems is called the…
a. Stratosphere
b. Hydrosphere
c. Biosphere
d. Troposphere
4.) Bat colonies in a cave during the day would illustrate a ______ dispersion
pattern.
a. Uniform
b. Even
c. Random
d. Clumped
5.) When the per capita birth rate equals the per capita death rate…
a. A population grows rapidly
b. The size of a population remains constant
c. A population is in danger of extinction
d. A population undergoes up-and-down cycles
6.) A population will always grow exponentially…
a. If it is limited only by density-dependent factors
b. Until it reaches carrying capacity
c. If there are no limiting factors
d. If it shows logistic growth
7.) Which of the following populations exhibits exponential growth?
a. A protozoan population in a sealed glass culture
b. A fruit fly population that recently arrived on an island previously
occupied by only plants
c. A population of deer in an area with many hungry wolves
d. A queen ant that moves to a new area to start a new colony
8.) No population can grow indefinitely. The ultimate size of any population is
limited by…
a. Its birth rate
b. Its death rate
c. The carrying capacity of its environment
d. Reproductive isolation
9.) A population that is growing logistically…
a. Grows fastest when density is lowest
b. Has a high r
c. Grows fastest at an intermediate population density
d. Grows fastest as it approaches carrying capacity
10.)
Which of the following would most likely be an example of a densityindependent factor limiting population growth?
a. Food availability
b. Diseases
c. Parasites
d. Daily temperature extremes
11.)
The cyclic growth exhibited by populations of showshoe hares in the
North America taiga most likely results from…
a. Predation by lynx
b. Fluctuations in the hare’s food
c. Hunting by humans
d. A and B
12.)
The niche of an animal is…
a. The number of individuals of the species the environment will
support
b. The same as its habitat
c. The way the animal fits into its environment
d. Its den or nest
13.)
When goats were introduced to a new island, the goats inhabited the
same areas and ate the same plants as the native deer. The deer population
dwindled and finally disappeared. This is an example of…
a. Commensalism
b. Succession
c. Herbivory
d. Competitive exclusion
14.)
A leech that attaches itself to a swimmer is an example of…
a. Prey
b. A parasitoid
c. An endoparasite
d. An ectoparasite
15.)
Certain species of acacia trees have hollow thorns that house stinging
ants, which attach anything that touches the tree. The ants feed on nutrients
produced by the acacias. This is an example of…
a. Mutualism
b. Predation
c. Competitive exclusion
d. Commensalism
16.)
What is the key difference between a keystone species and a
dominant species?
a. There is no difference. The two terms are synonymous.
b. Dominant species alter the structure the or dynamics of the
environment; keystone species are the most abundant
c. Dominant species are the most abundant; keystone species exert
control through important roles or niches
d. The removal of a dominant species from a community has more
impact than removing a keystone species
17.)
In the North Pacific, sea otters are keystone predators. A reduction in
their numbers has resulted in what changes in the marine community?
a. Competitive exclusion reduced species richness
b. Mutualism among prey species maintained species diversity
c. The absence of a keystone species decreased community diversity
d. Resource partitioning allowed otherwise competing species to coexist
18.)
Which statement below correctly describes conditions on a glacial
area during the reign of pioneer species?
a. Aldars predominate the landscape
b. Sphagnum moss becomes established and kills trees by acidifying the
soil
c. The landscape is covered by lichens, liverworts, mosses, and fireweed
d. The area is dominated by members of the genus Dryas
19.)
Temperature, precipitation, sunlight, and wind are the major
components of…
a. Biomes
b. Dispersal
c. Climate
d. Ecosystems