Experiment: Two groups of rats were raised in different light conditions-one in constant light, the other in a normal light-dark cycle. Melatonin levels were measured.Observation: Rats in constant light had lower melatonin levels than those in a light-dark cycle.Question: What conclusion is supported?
Correct answer: B. Melatonin production is influenced by light exposure.
- A. Rats produce melatonin regardless of lighting.
- B. Melatonin production is influenced by light exposure.
- C. Constant light increases melatonin.
- D. Melatonin is not related to light cycles.
Explanation
The correct answer is Option B: Melatonin production is influenced by light exposure. This conclusion is supported by the observation that rats in constant light had lower melatonin levels than those in a light-dark cycle. The other options are incorrect because they do not align with the experimental results and observations provided.
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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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