Unit 2 Test: Ecology Review

Which of these is NOT one of the basic characteristics of all living organisms?

• need and use energy
• maintain and sustain internal balance (homeostasis)
• have a genetic code (DNA)
• ability to move (run)

A large geographic area with similar climax communities, such as a tropical rainforest, is a...

• Biome
• Population
• Community
• Organism

An organisms place and role in an ecosystem, including where it lives and how it obtains the resources it needs to survive

• biodiversity
• niche
• predation
• population density

Many species of plants, insects, and small animals can live in a backyard. Which of the following is an example of a biotic factor in this ecosystem?

• a flower
• amount of rainfall
• oxygen given off by plants
• carbon dioxide given off by animals

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What does a decrease in salmon population due to an increase in river temperature indicate?

• an unchanging biological community
• change in population but not in abiotic factors
• an abiotic factor affecting a biotic factor
• an effect of predation

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Cheetahs and lions live in the same regions and eat the same food sources, such as gazelles and small wildebeests. Because of this, when food is limited, they often have to fight to survive. What kind of relationship exists between these organisms in the scenario?

• competition
• mutualism
• parasitism
• predation

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Mistletoe grows on trees. It sends its roots into the tree and uses the nutrients that could otherwise be used by the tree. If mistletoe benefits from the relationship and the tree is harmed, what kind of relationship exists between the two organisms?

• competition
• mutualism
• parasitism
• predation

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Unlike most mites, termites can digest wood. This ability comes from protozoa that live in the termite’s digestive tract. These protozoa produce enzymes that digest wood and they receive shelter and additional nutrients from the termites. What kind of relationship exists between the two organisms in this scenario?

• competition
• mutualism
• parasitism
• predation

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The graph below shows exponential growth of the world population. If the population continued to grow at its current rate, what would you expect to happen?

• Excessive amounts of energy would be released.
• Eventually resources and space would become limited causing the population to reach its carrying capacity.
• The amount of pollution would decrease.
• Eventually the human population would get so large that sustainability would be reached.

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The amount of oxygen in a fish tank is a _________ that affects the amount of fish that can live in the tank.

• Limiting factor
• Carrying capacity
• Characteristic of life
• Adaptation

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