alleryGoitre — a noticeable swelling of the neck — results from a deficiency of:
AIodine in the diet
BIron in the diet
CCalcium in the diet
DSodium in the diet
Answer & Solution
Correct answer: A. Iodine in the diet
1. Goitre is an enlargement of the thyroid gland.
2. The thyroid needs **iodine** to manufacture thyroxine.
3. When dietary iodine is low, the gland swells trying to capture more — this is goitre.
4. Iron deficiency causes anaemia; calcium deficiency weakens bones; sodium deficiency is unrelated to goitre.
_Source: Selina Concise ICSE Class 8 Biology Ch 5 "Endocrine System and Adolescence", Hormone-related disorders_
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