Ecology Review

Which statement concerning an ecosystem is correct?

• It can exist with or without a constant source of energy input.

• It must contain consumers but can exist without producers.

• It involves interactions between biotic and abiotic factors

• It can exist on land, but it cannot exist in lakes, rivers, or oceans.

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Energy for this ecosystem originally comes from

• water

• consumers

• sunlight

• plants

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An environment can support only as many organisms as the available energy, minerals, and oxygen will allow. Which term is best described by this statement?

• biological feedback

• carrying capacity

• homeostatic control

• biological diversity

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The reason that organisms can not produce populations of unlimited size is that

• the resources of Earth are finite

• there is no carrying capacity on Earth

• species rarely compete with one another

• interactions between organisms are unchanging

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What impact do the amounts of available energy, water, and oxygen have on an ecosystem?

• They act as limiting factors.

• ]They are used as nutrients.

• They recycle the residue of dead organisms.

• They control environmental temperature.

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Knowing the type of food consumed by an organism helps to identify the role of the organism in the community. This role is known as its

• nesting site

• territorial range

• biomass

• niche

Which statement best explains why the population stabilized?

• Interbreeding between members of the population increased the mutation rate.

• The population size became limited due to factors such as availability of food.

• An increase in the chipmunk population caused an increase in the producer population.

• A predator species came to the area and occupied the same niche as the chipmunks

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Which sequence shows increasing complexity of levels of ecological organization?

• biosphere, ecosystem, community

• biosphere, community, ecosystem

• community, ecosystem, biosphere

• ecosystem, biosphere, community

Great horned owls and red-tailed hawks have similar requirements for food, space, and nesting materials. What would most likely be the result of great horned owls and red-tailed hawks living in the same community?

• ecological succession

• competition

• habitat destruction

• parasitism

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An ecosystem will most likely remain stable if

• it has more predators than prey

• it has a high level of biodiversity

• biotic factors decrease

• finite resources decrease

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