EES Unit 7 - Biosphere Pre-test

How could the introduction of a nonnative species of plant affect an ecosystem in North Carolina?

• A. It could pollinate the native plant species, producing a disease-resistant species.

• B. It could reduce the competition for space and light with native plant species.

• C. It could take over the habitats of the native plant species.

• D. It could cause some insect species to destroy native plant species.

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Which is a biotic factor that could affect an ecosystem?

• A. dust storms moving through an ecosystem

• B. bacteria harming the health of organisms in an ecosystem

• C. large amounts of acid rain precipitation seeping into the soil in an ecosystem

• D. high levels of carbon dioxide entering the atmosphere within an ecosystem

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Why is it important to conserve the biodiversity of Earth?

• A. to decrease the amount of global predator populations

• B. to decrease the stability of major global ocean currents

• C. to increase the stability of ecosystems during environmental changes

• D. to increase the amount of nonrenewable resources located in the lithosphere

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What is the carrying capacity of an ecosystem?

• A. the total number of organisms alive at the same time in an ecosystem

• B. the minimum number of individuals needed to have balance in an ecosystem

• C. the total number of individuals, living and dead, that have been supported by an ecosystem

• D. the maximum number of individuals that an ecosystem can support without harming the ecosystem

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What will most likely happen to a stable ecosystem when a population of animals exceeds the ecosystem’s carrying capacity?

• A. The ecosystem will improve.

• B. The ecosystem will degrade.

• C. The ecosystem will change type.

• D. The ecosystem will remain unchanged.

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Can Earth’s human population increase indefinitely?

• A. yes, even though resources are finite

• B. yes, because resources are infinite

• C. no, even though resources are infinite

• D. no, because resources are finite

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Which of these is a threat to the survival of an ecosystem?

• A. predator-prey population cycles

• B. less biomass at higher levels of the food web

• C. a shrinking variety of animal and plant species

• D. competition among some consumer populations

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Which statement best describes how photosynthesis affects Earth’s energy budget?

• A. Photosynthesis destroys a significant amount of incoming solar radiation.

• B. Photosynthesis transforms a small amount of solar radiation into chemical energy.

• C. Photosynthesis increases the amount of solar energy that is reflected back into space.

• D. Photosynthesis prevents most of the incoming solar energy from heating Earth’s atmosphere.

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The human population is increasing every day. How does this increase in population affect the natural resources that maintain humans?

• A. increases the supply of resources

• B. decreases the amount of resources

• C. results in less demand for resources

• D. improves the quality of the resources

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In this human population graph that represents hundreds of years, what is likely to be happening at points 1 and 2?

• a drought at Point 1, and a technological advance at Point 2
• a technological advance at Point 1, and a drought at Point 2
• technological advances at Points 1 and 2
• droughts at Points 1 and 2

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