Experiment: A comparative study measured heart rate in frogs placed in cold vs. warm water.Observation: Frogs in cold water had slower heart rates than those in warm.Question: What is the conclusion?
Correct answer: B. Temperature affects metabolic rate in ectothermic animals.
- A. Frog hearts function independently of temperature.
- B. Temperature affects metabolic rate in ectothermic animals.
- C. Heat lowers frog heart rate.
- D. Heart rate in frogs is constant.
Explanation
The correct answer is that temperature affects metabolic rate in ectothermic animals. This conclusion is supported by the observation that frogs in cold water had slower heart rates than those in warm water. The other options are incorrect because they either contradict the observed results or make unsupported generalizations about heart rate in frogs.
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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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