1. A student observes that a plant in a sunny window grows taller than a plant in a dark closet. Which of the following statements is the 'Claim' in their scientific argument?
- A. The plant in the sun grew 10 cm.
- B. Plants require sunlight to grow.
- C. The plant in the closet grew 2 cm.
- D. The experiment used two identical pots.
2. Consider the following argument: 'My claim is that this rock is an igneous rock. I can see visible crystals in it.' What essential component of the CER framework is missing?
- A. A claim
- B. Evidence
- C. Reasoning
- D. A question
3. Which statement best demonstrates a complete and strong scientific argument using the CER framework?
- A. The substance is an acid. I know this because the litmus paper turned red, and acids turn litmus paper red.
- B. The litmus paper turned red. This means the substance is an acid. This is a chemical property of acids.
- C. Claim: The substance is an acid. Evidence: It is a sour-tasting liquid.
- D. Acids turn litmus paper red. I put litmus paper in the substance, and it turned red. Therefore, it is an acid.
4. In the Claim, Evidence, Reasoning (CER) framework for constructing a scientific argument, what is the primary role of the 'Reasoning' component?
- A. To present the raw data and measurements collected during an investigation.
- B. To provide a one-sentence answer to the initial scientific question.
- C. To connect the evidence to a broader scientific principle, explaining why the data supports the claim.
- D. To summarize the methods and materials used in the experiment.
5. A scientist argues that a newly discovered planet has a liquid water ocean. Which of the following statements would serve as 'Evidence' for this argument?
- A. Planets at a similar distance from their star often have liquid water.
- B. Therefore, the planet is a good candidate for harboring life.
- C. The presence of liquid water is a key ingredient for life as we know it.
- D. Spectrometer readings detected water vapor and surface reflections consistent with a liquid body.
6. If a strong antibiotic drastically reduces the population of helpful bacteria in the gut, what is a potential direct outcome?
- A. An increase in available space and nutrients for harmful microbes.
- B. A permanent strengthening of the person's immune system.
- C. The complete and permanent elimination of all bacteria from the gut.
- D. The rapid conversion of harmful bacteria into helpful species.
7. How does a dominant population of helpful bacteria maintain a healthy gut environment?
- A. By actively hunting and consuming harmful bacteria cells.
- B. By outcompeting harmful bacteria for essential resources.
- C. By sending signals to the brain to stop eating certain foods.
- D. By reproducing much more slowly than harmful bacteria.
8. Which scenario would make it easiest for a newly introduced harmful bacterium to establish a large population in the gut?
- A. The gut is already dominated by a diverse community of helpful bacteria.
- B. The person consumes a diet rich in fiber that feeds helpful bacteria.
- C. The gut's existing helpful bacteria population is small and struggling.
- D. The person has a very strong and active immune system.
9. The relationship between helpful and harmful bacteria in a healthy gut is best described as...
- A. predatory, where one group actively hunts the other.
- B. symbiotic, where both groups benefit each other.
- C. competitive, where they vie for the same limited resources.
- D. neutral, where the presence of one has no effect on the other.
10. What is the primary reason that large populations of helpful bacteria in the gut help prevent illness?
- A. They produce specialized antibiotics that directly kill all harmful bacteria.
- B. They consume available nutrients and space, limiting resources for harmful bacteria.
- C. They alter the gut's pH to a level that only they can tolerate.
- D. They form a physical barrier that harmful bacteria are unable to penetrate.