Modified True/False
Indicate
whether the sentence or statement is true or false. If false, change the identified word or
phrase to make the sentence or statement true.
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1.
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A
tapeworm living inside a wolf’s body is a predator.
_________________________
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2.
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All
of the members of a community belong to the same species.
_________________________
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3.
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Bees
and flowers are biotic factors in an ecosystem. _________________________
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4.
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Individuals decrease the size of a population when they emigrate from it.
_________________________
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5.
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The
population density decreases as the number of individuals in an area increases.
_________________________
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6.
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Population size generally increases if the birth rate is greater than the death
rate. _________________________
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7.
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The
carrying capacity is the smallest number of individuals in a population that can live in one
area. _________________________
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8.
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An
organism’s specific role, or how it makes its living, is its habitat.
_________________________
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9.
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In
predation, the organism that kills another organism for food is the prey.
_________________________
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10.
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Both
species benefit in the type of symbiosis called mutualism.
_________________________
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Essay
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11.
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Explain why two different species in an ecosystem can share the same habitat but not
the same niche.
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12.
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Explain the difference between a population and a community.
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13.
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Explain the difference between predation and parasitism.
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14.
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Explain the difference between direct and indirect observation in determining
population size.
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15.
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Define abiotic factor and give four examples.
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16.
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Explain why the populations of a predator and its prey often follow regular
cycles.
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17.
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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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18.
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An
ecologist counts 75 cardinals in an area measuring 15 square kilometers. What is the population
density of the cardinals?
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