Experiment: To test the role of sunlight in vitamin D synthesis, mice were divided into two groups: one exposed to sunlight, the other kept in the dark.Observation: Only the sun-exposed group had detectable vitamin D levels after 10 days.Question: What conclusion is valid?
Correct answer: B. Sunlight is necessary for vitamin D production.
- A. Vitamin D is made regardless of light.
- B. Sunlight is necessary for vitamin D production.
- C. Darkness accelerates vitamin D synthesis.
- D. Mice naturally lack vitamin D metabolism.
Explanation
The correct conclusion is that sunlight is necessary for vitamin D production, as evidenced by the experiment results where only the sun-exposed group had detectable vitamin D levels after 10 days. This outcome highlights the direct relationship between sunlight exposure and the synthesis of vitamin D. The other options are incorrect because they do not align with the experimental observation that sunlight plays a crucial role in this process.
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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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