Unit 2.7-Organism Relationships

Multiple Choice

Which of the following best explains why there are fewer organisms at the top of an energy pyramid?

• Energy is lost at each trophic level, so less is available for higher levels.

• Organisms at the top reproduce more slowly.

• Producers are less important than consumers.

• There is more food available at the top of the pyramid.

Multiple Select

Which of the following are types of organism relationships?

• Mutualism

• Commensalism

• Amensalism

• Predation

Multiple Choice

Which of the following best describes the relationship in mutualism?

• Both organisms benefit

• One organism benefits, the other is unaffected

• One organism is harmed, the other benefits

• One organism is harmed, the other is unaffected

Fill in the Blanks

In commensalism, one organism benefits and the other is

Multiple Choice

Which example best illustrates amensalism?

• Cattle trampling grass

• Tree frogs using plants for protection

• Fleas living off the blood of a host animal

• Owls hunting mice

Multiple Choice

What is the main difference between parasitism and predation?

• Parasitism harms one organism, while predation results in the death of one organism

• Parasitism benefits both organisms, while predation harms both

• Parasitism does not involve harm, while predation does

• Parasitism only occurs in plants, while predation only occurs in animals

Multiple Choice

Which of the following best describes the principle of competitive exclusion?

• Two species competing for the same limited resource cannot both thrive.

• Two species always share resources equally.

• One species always becomes extinct when competing.

• Species never compete for resources.