What is the most accurate relationship between thyroxine deficiency and goitre?
Answer and explanation
Correct answer: Iodine deficiency can reduce thyroxine formation and cause the thyroid gland to swell.
The thyroid gland needs iodine to synthesise thyroxine. When iodine intake is insufficient, thyroxine production may fall, and reduced thyroid hormone feedback can stimulate the gland to work harder. This increased stimulation may enlarge the thyroid, producing a swelling called goitre. Thus option A correctly connects iodine deficiency, reduced thyroxine formation, and thyroid enlargement. The remaining choices incorrectly mix insulin, adrenaline, auxin, roots, and blood-glucose regulation.
Frequently asked questions
What is the correct answer to this question?
Iodine deficiency can reduce thyroxine formation and cause the thyroid gland to swell.
Why is this the correct answer?
The thyroid gland needs iodine to synthesise thyroxine. When iodine intake is insufficient, thyroxine production may fall, and reduced thyroid hormone feedback can stimulate the gland to work harder. This increased stimulation may enlarge the thyroid, producing a swelling called goitre. Thus option A correctly connects iodine deficiency, reduced thyroxine formation, and thyroid enlargement. The remaining choices incorrectly mix insulin, adrenaline, auxin, roots, and blood-glucose regulation.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Control and Coordination.
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