5th Grade Science Unit 4 Lesson 2

How do the animals in the photograph affect their ecosystem?

• They take down trees that other organisms might need for shelter.

• They build dams that change the flow of streams and rivers.

• They block sunlight needed by native plant species.

• They use up the supply of oxygen in the water.

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Which of the following is NOT a way that trees affect their ecosystems?

• releasing oxygen into the atmosphere

• moving soil as root growth occurs

• absorbing water from the soil

• reducing the number of insects by eating them

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Which of the following affects the environment by making holes in tree trunks to capture insects for food?

• humans

• squirrels

• woodpeckers

• coral

Which of the following affects the environment by growing reef structures, which provide food and habitats for many types of organisms?

• zebras

• coral

• humans

• vines

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Which of the following affects the environment by changing existing ecosystems by building roads, schools, and homes?

• humans

• chickens

• beavers

• oak trees

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Which of the following affects the environment by moving and storing nuts, leading to trees growing in new locations?

• large-mouth bass

• Burmese pythons

• squirrels

• flowering plants

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Which of these describe an invasive species? Choose all that apply.

• better able to compete for resources than native species

• any species that is added to a new ecosystem

• usually dies out rapidly in its new ecosystem

• tends to spread rapidly and take over ecosystems

• usually lacks predators in the new ecosystem

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Which of these describes how this invasive species, Brazilian elodea, affects other plants in the ecosystems it enters? Choose all that apply.

• It crowds out other plants.

• It produces resources needed by other plants.

• It increases the number of native plants in the ecosystem.

• It blocks sunlight from plants that live deeper in the water.

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Moving soil as roots grow, moving materials to build homes.

• This effect is caused by plants only.

• This effect is caused by animals only.

• This effect is caused by plants and animals.

using water resources

• This effect is caused by plants only.

• This effect is caused by animals only.

• This effect is caused by plants and animals.

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