Choose the odd term: Thyroxine, Adrenaline, and Insulin are hormones; Iodine is a chemical element (nutrient), not a hormone. Identify the outlier.
Verbal Reasoning
Classification
Difficulty: Easy
Choose an option
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AThyroxine
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BAdrenaline
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CIodine
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DInsulin
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ENone of these
Answer
Correct Answer: Iodine
Explanation
Introduction / Context:Biology/chemistry classification contrasts biochemical messengers with a chemical element.
Given Data / Assumptions:
- Thyroxine, Adrenaline, Insulin → hormones secreted by endocrine glands.
- Iodine → trace element required for thyroid hormone synthesis, not itself a hormone.
Concept / Approach:Group by functional role in physiology: messenger hormone vs essential nutrient element.
Step-by-Step Solution:
Classify three as hormones with signaling roles.Classify Iodine as an element (I), necessary but not a hormone.Verification / Alternative check:Thyroxine contains iodine atoms, yet iodine is the raw element, not a secreted messenger.
Why Other Options Are Wrong:They are authentic hormones.
Common Pitfalls:Confusing “component of a hormone” (iodine in thyroxine) with “is a hormone.”
Final Answer:Iodine is the odd term.