Download Skills Worksheet

Name ______________________________ Class ___________________ Date __________________
Skills Worksheet
Test Prep Pretest
In the space provided, write the letter of the term or phrase that best completes
each statement or best answers each question.
_____ 1. In the exponential model of population growth, the growth rate
a. remains constant.
c. increases.
b. declines.
d. rises and falls.
_____ 2. The most important element of population growth is
a. immigration.
c. death rate.
b. emigration.
d. birthrate.
_____ 3. Most density-dependent factors that affect population growth are
a. biotic.
c. stable.
b. abiotic.
d. unimportant.
_____ 4. What form of interaction is taking place when a shark devours a seal?
a. commensalism
c. predation
b. mutualism
d. parasitism
_____ 5. When lions and hyenas fight over a dead zebra, their interaction is
called
a. mutualism.
c. commensalism.
b. competition.
d. parasitism.
_____ 6. Mutualism and commensalism are two types of
a. symbiosis.
c. parasitism.
b. competition.
d. predation.
_____ 7. In the face of competition, an organism may occupy only part of its
fundamental niche. That part is called its
a. biome.
c. realized niche.
b. community.
d. ecosystem.
_____ 8. The unique function an organism performs in its environment is called
its
a. species.
c. niche.
b. biodiversity.
d. habitat.
_____ 9. Limited resources are the main source of
a. competition.
c. predation.
b. disease.
d. All of the above
_____ 10. The resilience of an ecosystem depends largely on which factor(s)?
a. predation
c. biodiversity
b. competition
d. All of the above
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Biology
19
Populations and Communities
Name ______________________________ Class ___________________ Date __________________
Test Prep Pretest continued
Complete each statement by writing the correct term or phrase in the space
provided.
11. A characteristic of ______________________ is that they often do not kill
their prey because they depend on the prey for food and a place to live.
12. Virtually all plants contain toxic compounds that help protect the plants from
______________________.
13. Rabbits that were introduced to Australia in the 1850s multiplied so rapidly
because they had no ______________________.
14. The entire range of conditions an organism can tolerate is its
______________________ ______________________.
15. Back-and-forth evolutionary adjustments between interacting members of an
ecosystem are called ______________________.
16. When sea stars are kept out of their coastal communities, the population of
mussels in the ecosystem ______________________.
17. One important part of a population model is the ______________________
______________________.
18. Density-independent factors are variables that affect a population regardless of
the population ______________________.
19. An important competition among plants is for the abiotic factor of
______________________.
Read each question, and write your answer in the space provided.
20. Explain how the plant toxins in milkweed benefit monarch butterflies.
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Biology
20
Populations and Communities
Name ______________________________ Class ___________________ Date __________________
Test Prep Pretest continued
21. Explain how predation, competition, and biodiversity are related.
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
22. Explain how several species of warblers that consume insects in spruce trees
can occupy the same tree without competition.
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
23. What are two possible outcomes of competition?
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Biology
21
Populations and Communities
Name ______________________________ Class ___________________ Date __________________
Test Prep Pretest continued
Questions 24–25 refer to the figure below, which shows a growth pattern of a population.
Read each question, and write your answer in the space provided.
24. What population growth model does this graph illustrate?
_______________________________________________________________
25. Describe the changes in the line of the graph, and explain what causes the changes.
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Biology
22
Populations and Communities
Name ______________________________ Class ___________________ Date __________________
Answer Key:
Test Prep Pretest
1. c
2. d
3. a
4. c
5. b
6. a
7. c
8. c
9. a
10. d
11. parasites
12. predation, predators, or herbivores
13. competitors, competition, or predators
14. fundamental niche
15. coevolution
16. increases
17. growth rate
18. density
19. sunlight
20. Monarch caterpillars incorporate the toxins into their own tissues, which makes the butterflies
toxic to bird predators.
21. Predation can reduce the effects of competition among species. When an aggressive species is
controlled by predation, it allows other species to live in the environment, increasing biodiversity.
22. Competitive warblers divide the resources in spruce trees, with each species feeding in a different
part of the tree. This eliminates competition.
23. Competition can result in competitive exclusion of a species, or it can lead to the division of
resources.
24. logistic growth
25. The graph line indicates that the growth of a population starts slowly, then increases rapidly as
more individuals are added to the population. The line eventually levels off when the population
size reaches the environment’s carrying capacity, due to limiting factors.
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Biology
23
Populations and Communities