Interactions in Ecosystems - Savvas pg's 436-440

What is a predatory relationship in an ecosystem?

• A predatory relationship is when one organism kills another for food. The predator is the organism that kills another for food or nutrients, and the prey is the organism that is killed or hunted by another.

• A predatory relationship is when two organisms share food equally in an ecosystem.

• A predatory relationship is when one organism helps another without any benefit to itself.

• A predatory relationship is when two organisms compete for the same resources in an ecosystem.

Which of the following is an example of a predator?

• Gazelle

• Cheetah

• Plant

• Aphid

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

• True

• False

What are two types of interactions in ecosystems mentioned in the passage?

• Predatory and symbiotic relationships.

• Competitive and aquatic relationships.

• Herbivorous and abiotic relationships.

• Parasitic and geological relationships.

Explain how even prey animal populations benefit from the presence of predators.

• Even prey animal populations benefit because keeping prey populations controlled means that there will be food for all the plant-eaters.

• Prey animal populations benefit because predators help them find more water sources.

• Prey animal populations benefit because predators teach them how to hide better.

• Prey animal populations benefit because predators help them migrate to warmer climates.

What is symbiosis?

• A) A relationship in which two organisms live together and at least one benefits.

• B) A relationship where both organisms are harmed.

• C) A relationship where organisms compete for resources.

• D) A relationship where organisms do not interact.

Which of the following is an example of mutualism?

• A flea living on a dog

• A squirrel building a nest in a tree

• A bat pollinating flowers while feeding on nectar

• A tree shading the ground

Commensalism is a symbiotic relationship in which one species benefits and the other species is _________.

• neither helped nor harmed

• harmed

• helped

• destroyed

Parasitism is a symbiotic relationship in which one organism lives with, on, or in another and _______ it.

• harms

• helps

• ignores

• protects

Match the type of symbiotic relationship to its correct description:

• Both organisms benefit

• One organism benefits, the other is harmed

• One organism benefits, the other is harmed

• Both organisms benefit

• One organism benefits, the other is neither helped nor harmed

• One organism benefits, the other is neither helped nor harmed