Characteristics of Ecosystems

Ecosystems depend on organisms to _____ with each other to maintain stability.

• interact

• build

• eat

• grow

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An invasive species is a plant or animal that is ____ to an ecosystem.

• not native

• just visiting

• beneficial

• not real

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A rabbit depends on various plants in an ecosystem to survive. Which would most likely happen if a drought decreased the plant population?

• The rabbit population would increase.

• The rabbit population would decrease.

• The rabbit population would remain the same.

• The rabbit population would increase, then decrease quickly.

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Organisms are the _____ things in an ecosystem.

• factors

• living

• resources

• nonliving

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Plants compete for air, water, and ____ within ecosystems.

• space

• sunlight

• space and sunlight

• water

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Noah visited a park that had many oak trees. Which BEST describes the role of an oak tree in its ecosystem?

• Oak trees can live for a long time.

• Oak trees have leaves that change colors.

• Oak trees have strong branches and trunks.

• Oak trees are a source of food and shelter for animals.

Rabbits and coyotes living in the same area with plant life, including all living and non-living things in the area.

• Organism

• Population

• Community

• Ecosystem

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Which of the following is a primary characteristic of an ecosystem?

• Energy flow

• Magnetic field

• Gravitational pull

• Nuclear reaction

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In an ecosystem, which of the following is considered a biotic component?

• Water

• Sunlight

• Bacteria

• Minerals

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What role do decomposers play in an ecosystem?

• Produce energy

• Consume primary producers

• Break down dead material

• Compete with predators

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