Ecosystems & The Food Web

1. Scientists think that Tyrannosaurus rex was able to run at a speed of 12 miles per hour. Where did T. rex get the energy that it used to run when it was alive?

• a. T. rex got its energy from Triceratops. That energy is not connected to the Sun.
• b. T. rex got its energy from green plants, which got their energy from the Sun.
• c. T. rex got its energy from eating Triceratops. Triceratops ate green plants and green plants got their energy from the Sun.
• d. T. rex got its energy directly from the Sun.

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3. Describe how you would connect the organisms of the forest ecosystem to create food chains.

Answer explanation

To connect organisms in a forest ecosystem, start with producers like trees and plants, then link them to primary consumers such as herbivores (deer, insects). Next, connect these to secondary consumers (carnivores like foxes) to complete the food chains.

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4. Scientists are worried that a disease that kills oak trees will spread into this forest. What would happen to this ecosystem if all the oak trees suddenly disappear? Choose all correct answers.

• a. If there aren’t any oak trees, the squirrels will not have anything to eat. They will need to find another food source or they will not survive.
• b. If there aren’t any oak trees, the robins will not have anything to eat. They will need to find another food source or they will not survive.
• c. If there aren’t any oak trees, the hawks may not have anything to eat because the squirrels and robins may not survive.

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5. Amir released some pet frogs into the forest ecosystem shown above. These frogs eat earthworms and crickets. Hawks, robins, and squirrels do NOT eat these frogs. What will happen to this ecosystem if the frogs start living here? Choose all correct answers.

• a. The dead leaves will pile up because the frogs will eat all the decomposers. The decomposers will not be there to eat the leaves.
• b. The squirrels will not have anything to eat. They will need to find another food source or they will not survive.
• c. The robins will not have anything to eat. They will need to find another food source or they will not survive.
• d. The hawks will not have anything to eat. They will need to find another food source

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An organism that needs to eat other organisms to get energy is known as a:

• Autotroph
• Producer
• Consumer
• Mutualist

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What is this called?

• Food Web

• Food Chain

• Food Pyramid

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The sun is the major source of energy in a food chain.

• True

• False

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The main difference between a consumer and a producer is that

• a consumer makes it's own food and a producer gets food from other living things.

• a producer is part of a food chain, but a consumer is only part of a food web.

• a producer makes its own food, but a consumer must get food from other living things.