Science Unit 8- Ecosystems

What factor could cause a plant to become dormant?

• There is not enough water.

• It is going to make a flower.

• Bees are pollinating the plant.

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When it is very dry in the African Savannah, large herds of zebras and other animals move together as a group to find a source of water. What factor causes that migration?

• A. All animals must have water to live.

• B. Migrating animals look for rain.

• C. The animals need to find fish to eat.

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During the fall, bears will eat extra food and chipmunks will find seeds to store for eating later. Why are these animals most likely eating and storing extra food?

• These animals are preparing to hibernate during the cold winter.

• These animals are preparing to migrate and will need the food for the journey.

• These animals are preparing to survive a flood, and all their food will be washed away.

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Based on the information above, which animal is best supported in a desert ecosystem with high daytime temperatures?

• F. Black-tailed jackrabbit

• G. Marsh rabbit

• H. Mountain hare

• J. Volcano rabbit

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Which statement about the grassland ecosystem is best supported by the text in the book?

• The climate is cool in the grasslands because there is very little rain.

• Few trees grow in the grasslands because there is very little rain.

• The climate is hot in the grasslands because there is very little rain.

• Predators live in the grasslands because there is very little rain.

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Which food chain most accurately demonstrates the flow of energy in a shortgrass prairie ecosystem shown above?

• A. Grasshopper ⟶ bird ⟶ rodent ⟶ buffalo

• B. Hawk ⟶ snake ⟶ mouse ⟶ grasshopper

• C. Grasshopper ⟶ mouse ⟶ snake ⟶ hawk

• D. Snake ⟶ hawk ⟶ skunk ⟶ mouse

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What would most likely happen if the frog were removed from the ecosystem?

• There would be an increase in plant populations.

• There would be a decrease in sunlight.

• There would be an increase in insect populations.

• There would be a decrease in water levels.

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How can the flow of energy in the environment be described?

• Toads provide energy to butterflies.

• Nectar provides energy to flowers.

• Flowers provide energy to butterflies.

• Flowers provide energy to the Sun.

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What will most likely happen if bees are removed from the ecosystem?

• A. Flowers could be pollinated but would produce smaller seeds, making less food for plant-eaters.

• B. Some flowers would not be pollinated, fewer seeds would be produced, and there would be less food for plant-eaters.

• C. Flowers could be pollinated and would produce more seeds, making more food for plant-eaters.

• D. Flowers would not be pollinated, more seeds would be produced, and there would be more food for plant-eaters.

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After the floodwaters go down, which organisms will thrive the most?

• Bacteria that decompose dead animals

• Snakes who eat mice

• Plants that make their own food

• Mice that eat plants

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