Population Dynamics Quiz

If you were to graph the data in the table, it would show:

• an increase in the population over time.

• a decrease in the population over time.

• the population staying the same over time.

• an increase in population at first, followed by a decrease over time.

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What might be causing the pattern in these data?

• the population’s food resources became less abundant

• the population’s predators became less abundant

• the population’s habitat became less abundant

• the population’s competitors became more abundant

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Which statement best describes an important difference between plants and animals?

• Plants get food from the soil while animals get food by eating other organisms.

• Animals are alive but plants are not.

• Plants use carbon dioxide from the air and water to make their own food while animals get food by eating other organisms.

• Animals use energy stored in food but plants do not.

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The role of decomposers in an ecosystem is to:

• convert the sun’s energy into energy stored as food

• convert plant matter into matter that can be used by animals

• eat other living organisms for energy

• break down dead and waste matter

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A food web shows the flow of _______ through an ecosystem and the cycling of _______ within an ecosystem.

• matter, energy

• energy, matter

• nutrients, energy

• water, carbon

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The original source of energy for this food web is:

• soil

• the sun

• water

• nutrients

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The word “ecosystem” refers to:

• the physical environment

• living organisms

• living organisms and the physical environment

• living organisms in the laboratory

Which of the following statements about introduced species is TRUE?

• Most were introduced intentionally by people.

• They are more likely to cause problems in natural areas than in urban areas.

• They are unlikely to cause problem for people.

• Their impact on the local ecosystem is difficult to predict.

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Ronnie decides to release her pet mouse into the woods behind her house. The possible tradeoffs of her decision include:

• her mouse may die in its new habitat

• she may have introduced a new species into the woods

• both a and b

• there are no trade-offs associated with her decision

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Disruptions in ecosystems:

• can be caused by abiotic and biotic factors.

• can lead to short-term changes but not long-term changes.

• can lead to increased stability in the ecosystem.

• are usually caused by humans.

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