Upsetting the Balance – Multiple Choice Test (Grade 3)

What is the main idea of the first section of the text?

• Streams are dangerous places

• A healthy ecosystem has balance

• Bears are the most important animals

• Fish lay eggs in streams

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What does the word ecosystem most nearly mean in the text?

• A type of animal

• A place where living and nonliving things interact

• A deep ocean

• A forest only

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Which detail shows the stream is healthy?

• Animals are fighting for food

• Many different plants and animals live there

• The water is frozen

• There are no predators

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What happens when a new animal enters an ecosystem where it does not belong?

• Nothing changes

• It improves the ecosystem

• It can cause problems

• It leaves immediately

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What is an invasive species?

• A helpful animal

• A plant that grows slowly

• A living thing that does not belong in an ecosystem

• A native species

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Why are invasive species harmful?

• They make ecosystems stronger

• They disrupt food chains

• They help native species grow

• They only live for a short time

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According to the text, how are invasive species usually introduced?

• By weather changes

• By animals traveling alone

• By people, often accidentally

• By natural disasters only

What is the purpose of the heading “Zebra Mussels Flex Their Muscles”?

• To entertain the reader

• To introduce a new section topic

• To describe a character

• To summarize the whole text

Where were zebra mussels originally found?

• United States only

• South America

• Europe and Asia

• Africa

How did zebra mussels first arrive in the United States?

• Airplanes

• Ships carrying water

• Birds

• Rivers