Populations Review

The number of organisms born in a population during a certain time period.

• Birth Rate

• Death Rate

What is a limiting factor?

• a resource that can limit the size of a population

• a resource that can increase the size of a population

• a living organisms in an environment

• a nonliving factor in an environment

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Limiting factors are sometimes helpful because they can keep the population from getting too large.

• True

• False

The reason that organisms cannot produce populations of unlimited size is that

• Populations always stay exactly the same.

• The resources of Earth are limited.

• There is no carrying capacity for the whole Earth.

• Species rarely compete with each other for food.

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In the graph to the right, what is the population of deer at the carrying capacity of the environment?

• 3

• 7

• 70

• 40

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In a forest ecosystem, which of the following is NOT an example of a limiting factor that would greatly affect a rabbit population?

• a rainy season

• a disease that causes rabbits to die

• grass available to eat

• the population of hawks that eat rabbits

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When a population grows past the ecosystem's carrying capacity, what happens to the population?

• It continues to grow higher and higher.

• The population starts to die off and returns to the carrying capacity.

• The population will go extinct due to lack of resources.

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The graph to the right shows the interaction of the wolf and moose populations on Isle Pekie. If the moose population continues to increase, the wolves' food supply will increase. What will most likely happen to the wolf population as a result?

• It will decrease.

• It will increase.

• It will remain the same.

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The picture to the right represents a sunny, dry desert.

Which factor most likely limits the desert’s carrying

capacity for plant life?

• the number of animals that eat plants

• the amount of sunlight

• the availability of space to grow

• the availability of water

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Which factor that limits a population’s size is important especially when population numbers become large and dense?

• seasonal changes

• extreme weather

• competition for food

• sea level height

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