Web of Life Unit Test

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?

• T. rex got its energy from Triceratops. That energy is not connected to the Sun.

• T. rex got its energy from green plants, which got their energy from the Sun.

• T. rex got its energy directly from the Sun.

• T. rex got its energy from eating Triceratops. Triceratops ate green plants and green plants got their energy from the Sun.

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Scientists think that the dinosaurs went extinct because an asteroid hit the Earth and created a giant dust cloud that covered up the Sun. Diego doesn’t think this explanation makes sense. He says, “Some dinosaurs ate other dinosaurs to get their energy. Why would removing the Sun cause the carnivores to go extinct?” Explain to Diego why carnivores would go extinct without the Sun. You can use evidence from the energy model above.

• Carnivores would go extinct without the Sun because they get their energy from the Sun. Carnivores do not produce their own food or eat green plants, but the organisms that they eat get their energy from green plants. The energy can be traced back to the Sun.

• Carnivores would not go extinct without the Sun because they get their don't energy from the Sun. Carnivores produce their own food and eat green plants. The energy can't be traced back to the Sun.

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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?

• 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.

• 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.

• If there aren’t any oak trees, the hawks may not have anything to eat because the squirrels and robins may not survive.

• All of the above.

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The energy in all ecosystems originally comes from:

• Sunlight

• Plants

• Heat

• Water

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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.

• The dead leaves will pile up because the frogs will eat all the decomposers. The decomposers will not be there to eat the leaves.

• The squirrels will not have anything to eat. They will need to find another food source or they will not survive.

• The robins will not have anything to eat. They will need to find another food source or they will not survive.

• The hawks will not have anything to eat. They will need to find another food source or they will not survive.

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Ana wants to open a plant store, but she’s worried that it will cost too much money. Ana thinks that as plants grow, they use the material from the soil to get bigger. Potting soil costs a lot of money. Ana is worried she will need to buy a lot of soil to feed her plants. She decides to set up an experiment. Ana grows one plant in a pot for 3 weeks. She weighs the plant and the soil at the start and end of the experiment.

PLANT START: 300 grams END: 800 grams

SOIL START: 800 grams END: 800 grams

What did Ana find out with her experiment? Check all that apply.

• The plant weighed the same at the start and end of the experiment.

• The plant weighed more at the end of the experiment.

• The soil weighed the same at the start and end of the experiment.

• The soil weighed less at the end of the experiment.

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Do you think Ana should be worried about the cost of soil for her plant store? Why or why not? Provide an argument based on the results of her experiment.

• Yes, I think Ana should be worried because the experiment shows that the plant does “eat” the soil when it grows

• No, I do not think Ana should be worried because the experiment shows that the plant does not “eat” the soil when it grows.

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PLANT A START: 300 grams END: 300 grams

PLANT B START: 300 grams END: 750 grams

Ana decides to do another experiment. She starts with two plants, Plant A and Plant B. Each plant weighs 300 grams. She attaches Plant A to a vacuum. The vacuum pumps all of the air out of the container around Plant A. Plant B is not attached to a vacuum, so it has air around it. Ana gives Plant A and Plant B the exact same amount of water. She runs the experiment for 3 weeks and then weighs the plants at the end of the experiment.

Looking at Ana’s experiments, what is a claim that you can make about plants and their growth?

• Plants mostly use materials from the soil for their growth.

• Plants mostly use materials from the air for their growth.

• Plants mostly use materials from water for their growth.

• Plants mostly use materials from sunlight for their growth.

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What evidence do you have to support your claim from the question above? Provide an argument using evidence from Ana’s experiments to support your claim.

• Plants do not use materials from the air for their growth. The first experiment showed that plants use soil for their growth. The second experiment showed that plants grow without air.

• Plants mostly use materials from the air for their growth. The first experiment showed that plants do not use soil for their growth. The second experiment showed that plants do not grow without air.

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