Interactions in an Ecosystem

relationship in which two species live closely together

• resource

• mutualism

• succession

• symbiosis

A living relationship between two species in which one organism is harmed is called...

• mutualism

• commensalism

• parasitism

• niche

The crocodile and bird have a _______________ relationship. The crocodile benefits by having its teeth cleaned. The bird benefits by gaining food and protection. Both animals benefit from this relationship.

• parasitism

• predator and prey

• mutualism

• commensalism

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When predator numbers decrease, prey numbers ____________ because fewer of them are being consumed.

• decrease

• increase

• stay the same

• divide in half

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The lavender plant serves an important role in the life cycle of the monarch butterfly. Adult monarchs lay their eggs in the lavender plant, and then the monarch caterpillars eat that same plant during their development.

Based on the relationship between monarchs and lavender, what is one reasonable prediction a scientist could make?

• If the lavender population goes down, the monarch population will do down.

• Population of monarch butterflies should remain constant when lavender population decreases.

• A decrease in the lavender population would cause a monarch butterfly population increase.

• If the population of lavender remains constant (the same), the monarch butterfly population increases.

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WHEN A LEECH FEEDS OFF OF A LIVING ORGANISMS BLOOD IT IS CALLED...

• PREDATION

• COMPETITION

• PARASITISM

WHICH IS A BIOTIC FACTOR?

• RABBIT

• ROCK

• RAINBOW

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Which term best describes two predators living in the same habitat who feed on the same prey?

• coexistence

• competition

• mutualism

• predatory

Which of these is an example of one living thing depending on another living thing?

• Cat walking on the sand

• Bird building a nest in a tree

• Dog warming in the sunlight

• Squirrel drinking water

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All of the following are examples of living things interacting with each other EXCEPT —

• birds preying on insects living in the grass

• squirrels spreading the seeds of trees by burying them

• frogs sleeping in the mud at the bottom of the pond

• fish eating plants and other smaller fish

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