Ch. 8 Populations and Communities
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. An organism's habitat must provide all of the following EXCEPT
a. food.
b. water.
c. predators.
d. shelter.
____
2. The nonliving parts of an ecosystem are called
a. populations.
b. organisms.
c. biotic factors.
d. abiotic factors.
____
3. To produce their own food, algae and plants use the abiotic factors sunlight, carbon dioxide, and
a. soil.
b. salt.
c. water.
d. bacteria.
____
4. A population is all the members of one species living in a particular
a. area.
b. habitat.
c. ecosystem.
d. community.
____
5. A group of antelope leaving the herd in search of better grassland is an example of
a. immigration.
b. emigration.
c. increasing birth rate.
d. decreasing death rate.
____
6. If you count 20 beetles in a garden measuring 5 square meters, the population density of the beetles is
a. 100 beetles per square meter.
b. 20 beetles per square meter.
c. 5 beetles per square meter.
d. 4 beetles per square meter.
____
7. An organism's particular role in its habitat, or when and how it survives, is called its
a. carrying capacity.
b. ecosystem.
c. competition.
d. niche.
____
8. All of the following are examples of limiting factors EXCEPT
a. food.
b. soil.
c. space.
d. weather conditions.
____
9. Which of the following is an example of a predator adaptation?
a. a porcupine's needles
b. a shark's powerful jaws
c. a frog's bright colors
d. a plant's poisonous chemicals
____ 10. A hawk building its nest on an arm of a saguaro cactus is an example of
a. commensalism.
b. mutualism.
c. parasitism.
d. predation.
____ 11. The place where an organism lives and that provides the things the organism needs is called its
a. habitat.
b. population.
c. species.
d. community.
____ 12. Which of the following is a biotic factor in the prairie ecosystem?
a. water
b. sunlight
c. soil
d. grass
____ 13. The behaviors and physical characteristics of species that allow them to live successfully in their environment
are called
a. habitats.
b. limiting factors.
c. biotic factors.
d. adaptations.
____ 14. The struggle between organisms to survive in a habitat with limited resources is called
a. competition.
b. predation.
c. symbiosis.
d. parasitism.
____ 15. The series of changes that occurs after a disturbance in an existing ecosystem is called
a. primary succession.
b. secondary succession.
c. disturbance succession.
d. pioneer succession.
____ 16. The first species to populate an area where primary succession is taking place are called
a. secondary species.
b. primary species.
c. pioneer species.
d. succession species.
____ 17. Population density is defined as
a. an approximation of a number, based on reasonable assumptions.
b. the number of individuals of a population in a specific area.
c. the number of individuals moving into a population.
d. the smallest level of ecological organization.
____ 18. The largest population that an environment can support is called its
a. carrying capacity.
b. limiting factor.
c. birth rate.
d. death rate.
____ 19. An early winter frost preventing further growth in a tomato garden is an example of
a. carrying capacity.
b. a limiting factor.
c. a biotic factor.
d. indirect observation.
____ 20. The smallest unit of ecological organization is a single
a. population.
b. community.
c. organism.
d. ecosystem.
____ 21. Which of the following is an example of a population?
a. the cats and dogs in your neighborhood
b. the bushes and grass in a park
c. the rocks in a rock collection
d. the gray wolves in a forest
____ 22. All the different populations that live together in an area make up a(n)
a. organism.
b. community.
c. species.
d. ecosystem.
____ 23. The study of how things interact with each other and with their environment is called
a. ecology.
b. photosynthesis.
c. community.
d. biotic studies.
____ 24. When a flea is living on a dog, the dog is the
a. parasite.
b. host.
c. predator.
d. prey.
____ 25. Mutualism, commensalism, and parasitism are the three types of
a. symbiotic relationships.
b. predation.
c. competition.
d. prey adaptations.
Ch. 8 Populations and Communities
Answer Section
MULTIPLE CHOICE
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15. ANS:
C
PTS: 1
DIF: L2
Identify what an organism gets from its environment.
comprehension
D
PTS: 1
DIF: L1
Identify biotic and abiotic parts of a habitat.
knowledge
C
PTS: 1
DIF: L2
Identify biotic and abiotic parts of a habitat.
comprehension
A
PTS: 1
DIF: L1
Describe the levels of organization within an ecosystem.
knowledge
B
PTS: 1
DIF: L2
Explain the causes of changes in population size.
application
D
PTS: 1
DIF: L3
Explain the causes of changes in population size.
application
D
PTS: 1
DIF: L1
Explain how an organism's adaptations help it survive.
knowledge
B
PTS: 1
DIF: L2
Identify factors that limit population growth.
comprehension
B
PTS: 1
DIF: L2
Describe the competition and predation.
application
A
PTS: 1
DIF: L2
Identify the three types of symbiotic relationships.
application
A
PTS: 1
DIF: L1
Identify what an organism gets from its environment.
knowledge
D
PTS: 1
DIF: L2
Identify biotic and abiotic parts of a habitat.
comprehension
D
PTS: 1
DIF: L1
Explain how an organism's adaptations help it survive.
knowledge
A
PTS: 1
DIF: L1
Describe the competition and predation.
knowledge
B
PTS: 1
DIF: L1
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Describe the differences between primary and secondary succession.
e_ch01_029 BLM: knowledge
C
PTS: 1
DIF: L2
Describe the differences between primary and secondary succession.
e_ch01_030 BLM: comprehension
B
PTS: 1
DIF: L1
Explain the causes of changes in population size.
TOP: e_ch01_027
knowledge
A
PTS: 1
DIF: L1
Identify factors that limit population growth.
TOP: e_ch01_009
knowledge
B
PTS: 1
DIF: L2
Identify factors that limit population growth.
TOP: e_ch01_016
application
C
PTS: 1
DIF: L1
Describe the levels of organization within an ecosystem. TOP: e_ch01_003
knowledge
D
PTS: 1
DIF: L2
Describe the levels of organization within an ecosystem. TOP: e_ch01_004
application
B
PTS: 1
DIF: L1
Describe the levels of organization within an ecosystem. TOP: e_ch01_023
knowledge
A
PTS: 1
DIF: L1
Describe the levels of organization within an ecosystem. TOP: e_ch01_024
knowledge
B
PTS: 1
DIF: L2
Identify the three types of symbiotic relationships.
TOP: e_ch01_025
application
A
PTS: 1
DIF: L1
Identify the three types of symbiotic relationships.
TOP: e_ch01_026
knowledge