Web of Life (Unit 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?

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

• T.rex got his energy fro green plants, which got their energy from the sun.

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

• T. rex got its energy directly 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.

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Categorize into producers, consumers, and decomposers.

Groups:

(a) producers

,

(b) consumers

,

(c) decomposers

• 
• 
• 
• 
• 
• 
• 
• 
• 

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What is the difference between a question and a hypothesis?

What is the correct order to the Scientific Method?

• Ask a question

• Results and Conclusion

• Construct a hypothesis

• Test and gather data

• Do background research

Paul was helping his mom make dinner. He was in charge of reheating the beans from the day before. When he went to put the beans in the microwave, the microwave did not turn on. What observation can you make from this scenario?

Paul was helping his mom make dinner. He was in charge of reheating the beans from the day before. When he went to put the beans in the microwave, the microwave did not turn on. Let's say that your observation was that the microwave did not work. The question in this problem would be "why is my microwave not working?" Form a hypothesis for this question. Remember that a hypothesis is an educated guess that is a cause/effect statement.

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

The results of Chelsea's experiment are shown in the picture. What did Chelsa find out with her experiment?

Groups:

(a) True

,

(b) False

• The soil weighted the same at the start and the end of the experiment

• The soil weightd less at the end of the experiment

• The plant weighted the same at the start adn end of the experiment

• The plant weighted more at the end of the experiment

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Chelsea 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 weights the plants at the end of the experiment.

Looking at Chelsea'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 water for their growth

• Plants mostly use materials from the sunlight for their growth

• Plants mostly use materials from the air for their growth

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Scenario One: The effect of fertilizer on plants.

John’s biology class was studying carious ways to recycle materials, including the use of compost as fertilizer. Members of John’s class investigated the effectiveness of various recycled materials in promoting plant growth. John and three members of his lab group decided to compare the effect of compost and commercial fertilizer on plant growth. Three flats of bean plants (25 plants per flat) were grown for five days. The plants were then fertilized as follows: Flat A received 10 grams of commercial fertilizer; Flat B received 10 grams of aged compost; and Flat C received no fertilizer. The plants received the same amount of sunlight and water each day. At the end of 20 days, the students recorded the height of the plants in centimeters.

Groups:

(a) Dependent Variable

,

(b) Independent Variable

,

(c) Controlled Variable

• sunlight

• compost

• height of the plant

• commercial fertilizer

• amount of water

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