Experiment: Two groups of mice were fed diets with and without iodine for four weeks. Thyroid size and hormone levels were then measured.Observation: Mice on iodine-deficient diets had enlarged thyroids and low hormone levels.Question: What is the most valid conclusion?
Correct answer: C. Iodine is essential for normal thyroid hormone production.
- A. Thyroid size decreases with iodine deficiency.
- B. Iodine causes thyroid suppression.
- C. Iodine is essential for normal thyroid hormone production.
- D. Diet has no impact on endocrine glands.
Explanation
The correct conclusion is that iodine is essential for normal thyroid hormone production. This is supported by the observation that mice on iodine-deficient diets had enlarged thyroids and low hormone levels, indicating the importance of iodine in maintaining normal thyroid function. The other options are incorrect because they do not accurately reflect the relationship between iodine deficiency and thyroid outcomes observed 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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