Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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If a kestrel eats a mouse that eats grass, the kestrel is a
a. | producer. | b. | second-level consumer. | c. | first-level
consumer. | d. | decomposer. |
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2.
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An organism that can make its own food is called a
a. | consumer. | b. | decomposer. | c. | producer. | d. | scavenger. |
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3.
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Consumers that eat both plants and animals are called
a. | omnivores. | b. | herbivores. | c. | carnivores. | d. | scavengers. |
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4.
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Vultures, which feed on the bodies of dead organisms, are
a. | first-level consumers. | b. | scavengers. | c. | producers. | d. | herbivores. |
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5.
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The first organism in a food chain is always a
a. | consumer. | b. | herbivore. | c. | carnivore. | d. | producer. |
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6.
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To produce their own food, algae and plants use the abiotic factors sunlight,
carbon dioxide, and
a. | soil. | b. | salt. | c. | water. | d. | bacteria. |
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7.
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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. |
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8.
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The largest population that an environment can support is called its
a. | carrying capacity. | b. | limiting factor. | c. | birth
rate. | d. | death rate. |
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Short Answer
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9.
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What would happen to the other organisms if all the plants in this ecosystem
died?
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10.
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Which organisms shown are producers?
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11.
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Use the organisms pictured in this ecosystem to construct a food chain.
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12.
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Which organisms shown are consumers?
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13.
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What happened to the pheasant population between Point B and Point C?
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14.
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How was the pheasant population changing at Point A?
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15.
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Which letter marks the peak of the pheasant population?
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16.
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What are some possible explanations for the change in pheasant population
between Point B and Point C?
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17.
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In 1990, a large resort hotel was built on the island where these pheasants
live. Explain how this might have affected the pheasant population.
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18.
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What is the smallest unit of organization in an ecosystem? Give one example from
the diagram.
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19.
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List three biotic resources and two abiotic resources in the prairie
ecosystem.
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20.
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Is the prairie soil a biotic factor or an abiotic factor? Explain your
answer.
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21.
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Describe three factors that could limit the growth of the prairie dog
population.
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22.
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Describe two things the prairie dogs need to live that they obtain from their
habitat.
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23.
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What level of ecological organization do all of the owls in a certain area
represent?
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24.
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How did the eggshell thicknesses of bird species A and B change between 1945 and
1950?
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25.
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How is eggshell thickness related to the survival of bird species A and
B?
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26.
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How might bird species A and B come into contact with DDT, a pesticide used by
farmers?
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27.
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About how many years did it take the world population to increase from 1 billion
to 2 billion people?
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28.
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What are some reasons for the change in the human population after 1650?
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29.
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By how many people has the human population grown in the time period
shown?
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Essay
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30.
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Explain why decomposers are essential to life on Earth.
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31.
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Construct a food chain that includes you. Identify the producers and types of
consumers.
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32.
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Classify these examples of symbiosis by type and explain your choice: 1) Inside
a human's intestine live bacteria that make vitamin K; 2) A human picks up bacteria on his or
her hands. The bacteria do not cause disease but do feed on the human's dead skin cells; 3) A
tick attaches itself to a human and feeds on the human's blood.
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33.
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Explain why the populations of a predator and its prey often follow regular
cycles.
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