Experiment: Rats were exposed to increasing doses of caffeine, and heart rate was recorded over time.Observation: A consistent rise in heart rate was observed with higher caffeine doses.Question: What is the likely conclusion?
Correct answer: B. Caffeine stimulates the cardiovascular system.
- A. Caffeine reduces heart rate under stress.
- B. Caffeine stimulates the cardiovascular system.
- C. Caffeine has no biological effects.
- D. Rats are immune to caffeine.
Explanation
The correct answer is that caffeine stimulates the cardiovascular system because the experiment showed a consistent rise in heart rate with increasing caffeine doses. This indicates a direct relationship between caffeine and heart rate. The other options are incorrect because they do not align with the observed data in the experiment.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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