Ecology

Keystone species are responsible for what in an ecosystem?

• They help to support the biodiversity of an ecosystem.

• They limit the biodiversity within an ecosystem.

• They decrease the population numbers of different species.

• They are introduced to an ecosystem and eat other species to extinction.

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What is the difference between a community and an ecosystem?

• A community includes everything an ecosystem has, plus all of the abiotic factors.

• An ecosystem includes everything a community has, plus all of the abiotic factors.

• A community is where different populations live, an ecosystem has fewer populations.

• An ecosystem only includes a group of the same species in the same place at the same time

Humans can manipulate populations. One way to decrease a population's carrying capacity is to _____.

• Eliminate the predators of that population.

• Plant more vegetation that the population may consume

• Introduce a new predator of that population

• Increase the land that the population lives on

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The Kaibab National Forest is a 450 square mile area filled with thick trees, streams, and rock studded mountains. It is home to large populations of deer, elk, and many other organisms. It is surrounded by other forests in the same area. What type of ecological level is this a description of?

• Population

• Biosphere

• Species

• Ecosystem

Carrying capacity is __________

• The number of organisms in a community

• The number of organisms that an ecosystem can support over time

• The factor that controls a population

• When the population reaches its biotic potential

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When looking at an ecosystem, what would happen if a keystone species went extinct?

• The ecosystem would collapse and all of the species in it would go extinct.

• Some of the species would go extinct, and all others would be affected.

• Many of the species will be affected, though none of them will go extinct.

• Only the keystone species will be affected, the others will not change.

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What is true about the relationship between a population and a community?

• A population does not specify the area they live, a community does.

• A time frame is not specified for a population, it is for a community.

• Populations and communities are the same thing.

• A community includes all of the different populations in an area.

Ecological succession is the process of changing the species structure of a _______ over time

• Population

• Community

• Ecosystem

• Biome

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What is the calculated carrying capacity of this graph?

• 380 organisms

• 400 organisms

• 420 organisms

• 440 organisms

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A non-native species is accidentally introduced to the island that out-competes the deer for the acorns that are a main part of their diet. What could potentially happen to the population of deer on the island?

• The population of deer would increase

• The population of deer would decrease

• The population of deer would stay the same

• The deer population would leave the island

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