T8E3 Interactions in Ecosystems

What is a predatory relationship in an ecosystem?

• In a predatory relationship, one organism kills another for food or nutrients.

• In a predatory relationship, two organisms benefit from each other.

• In a predatory relationship, organisms compete for the same resources.

• In a predatory relationship, one organism is harmed while the other is unaffected.

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Which of the following is an example of a predator?

• A) Gazelle

• B) Cheetah

• C) Grass

• D) Tree

Predators help keep ecosystems in balance by limiting the size of prey populations.

• True

• False

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Tiny animals can also be predators in an ecosystem because:

• they are at the top of the food chain.

• they can hunt and consume other smaller organisms.

• they are herbivores.

• they do not have any natural enemies.

What is mutualism?

• A relationship where both species benefit

• A relationship where one species is harmed

• A relationship where one species benefits and the other is unaffected

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In commensalism, one species benefits and the other species is _______.

• neither helped nor harmed

• harmed

• helped

• extinct

What is parasitism?

• A) A relationship where both species benefit

• B) A relationship where one species is harmed

• C) A relationship where one species benefits and the other is unaffected

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What type of relationship does a lion have with a zebra?

• A) Predator/Prey

• B) Mutualism

• C) Commensalism

• D) Parasitism

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Fill in the blank: A tick is involved in a _______ relationship with birds and mammals.

• Parasitism

• Mutualism

• Commensalism

• Predation

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What type of relationship does a zebra have with a tick?

• A) Predator/Prey

• B) Mutualism

• C) Parasitism

• D) Commensalism

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