Download Populations and Communities Chapter 20 Test

Name ____________________________ Date ____________________ Class ____________
Populations and Communities
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Chapter Test
Populations and Communities
____ 1. competition
____ 2. population
____ 3. abiotic factors
____ 4. mutualism
____ 5. carrying capacity
____ 6. ecosystem
____ 7. species
____ 8. limiting factors
a. The largest population that an
environment can support
b. A symbiotic relationship in which one
species benefits and the other species is
neither helped nor harmed
c. An interaction in which one organism
kills and eats another organism
d. All the members of one species in a
particular area
____ 9. commensalism
e. Environmental conditions that cause
populations to decrease
____ 10. community
f. The nonliving parts of an ecosystem
____ 11. biotic factors
g. Behaviors and physical characteristics
of species that allow them to live successfully in their environment
____ 12. adaptations
____ 13. predation
h. A group of organisms that are physically similar and can mate with each
other and produce offspring that can
also mate and reproduce
i. All the different populations that live
together in an area
j. A symbiotic relationship in which both
species benefit
k. The struggle between organisms to survive in a habitat with limited resources
l. The living parts of an ecosystem
m. All the living and nonliving things that
interact in a particular area
True or False
If the statement is true, write true. If it is false, change the underlined word or words
to make the statement true.
____ 14. If a population is very large or spread out, ecologists use the
sampling method to estimate the population’s size.
____ 15. All the different species living in an area form a population.
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Populations and
Communities
Matching
Match each term with its correct definition. Write the letter of the correct answer on
the line.
Name ____________________________ Date ____________________ Class ____________
Populations and Communities
■
Chapter Test
____ 16. An organism’s specific role in its habitat is called its niche.
____ 17. Every organism has a variety of habitats that enable it to live
successfully in its environment.
____ 18. Water, sunlight, and oxygen are examples of abiotic factors in
ecosystems.
Problems
Solve the following problems. Show all your work.
19. Students counted 45 sand crabs in a 5-meter by 3-meter section of a
beach. What was the population density of sand crabs in that section?
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20. The entire beach measured 40 meters by 15 meters. Estimate the total
population of sand crabs on the entire beach.
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Essay
Answer each of the following items in the spaces provided.
21. Use an example to explain how a limiting factor can prevent a population
from increasing indefinitely.
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22. Identify one example of parasitism, and describe the interaction between
the two species. Explain why parasites usually do not kill their hosts.
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Name ____________________________ Date ____________________ Class ____________
Populations and Communities
■
Chapter Test
Pheasant Population
Number of Pheasants
per Square Kilometer
50
40
30
20
10
2
4
6
8
10
12
14
16
18
20
22
24
26
Year
23. Interpreting Graphs How did the pheasant population change between
year 1 and year 10? How did the population change between year 10 and
year 18?
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24. Inferring What might be some possible explanations for the change that
occurred between year 10 and year 18?
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25. Predicting In the winter of year 25, a family of coyotes made its way to
the island over the frozen lake. What do you think will happen to the
pheasant population, and why?
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Populations and
Communities
Using Science Skills
Pheasants were introduced onto an island. The graph below shows what happened
to the pheasant population over a 25-year period. Use the graph to answer Questions
23–25. Write your answers in the spaces provided.
Name ____________________________ Date ____________________ Class ____________
Populations and Communities
■
Chapter Test
Populations and Communities
(continued)
Using Science Skills
The table below shows the populations of mallard ducks, snapping turtles,
and raccoons living in and around a pond. Snapping turtles prey on
ducklings. Raccoons prey on duck eggs and turtle eggs.
1988
1989
1990
1991
1992
1993
1994
Mallard ducks
47
52
48
50
55
62
52
Raccoons
20
22
24
23
8
4
9
Snapping turtles
5
6
5
8
15
24
12
Number of Animals
60
50
40
30
20
10
1988
1989
1990
1991
Year
1992
1993
1994
26. Graphing On the graph above, plot the total populations of ducks,
turtles, and raccoons each year. Use a different color for each population.
Answer the following questions on a separate sheet of paper.
27. Interpreting Graphs In what year did a sudden change occur in the sizes
of all three populations? What happened to the size of each population?
28. Inferring What can you infer from the data about the types of
interactions between mallard ducks, raccoons, and snapping turtles?
Explain your answer.
Essay
Answer each of the following items on a separate sheet of paper.
29. What do you think caused the sudden change in the population sizes you
graphed in item 26 above? Explain your answer.
30. Some prey species blend with their surroundings. Other prey species are
brightly colored. Explain why these different defenses help both kinds of
species to survive.
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