Interactions in Ecosystems

Multiple Choice

Why are interactions between organisms important in an ecosystem?

• They help maintain balance and stability in the ecosystem.

• They always lead to competition and extinction.

• They only benefit predators.

• They have no effect on the ecosystem.

Multiple Select

Which of the following represent a predator?

• Coyote

• Robin

• Lizard

• Tree

Multiple Choice

Which of the following best describes a predatory relationship?

• One organism benefits and the other is harmed

• Both organisms benefit

• One organism benefits and the other is unaffected

• Both organisms are harmed

Multiple Choice

In which type of symbiotic relationship do both species benefit?

• Mutualism

• Commensalism

• Parasitism

• Predation

Multiple Choice

How do predatory relationships help maintain balance in an ecosystem?

• By increasing the number of prey

• By limiting prey population sizes

• By eliminating all predators

• By making all organisms herbivores

Multiple Choice

Which of these observations describe competition between the organisms or populations? 6.12B

• A) 1, 3, 4

• B) 1, 2, 4

• C) 2, 3, 4

• D) 1, 2, 3

Multiple Select

Which sentences describe competitive relationships between animals? Choose two correct answers. 6.12A Check all that apply.

• Wolves hunt in a group or pack to capture their prey.

• Leafcutter ants bring leaves back to their nest to make food.

• Several mosquitos lay eggs in a small body of water.

• Two birds eat the berries on the same vine.