alleryBoth triiodothyronine (T3) and thyroxine (T4) are secreted by which gland, whose two lobes are joined by an isthmus?
AParathyroid gland
BAdrenal gland
CThyroid gland
DPituitary gland
Answer & Solution
Correct answer: C. Thyroid gland
1. The thyroid gland has two lobes on either side of the trachea joined by a band called the isthmus.
2. Its hormones are triiodothyronine (T3) and tetraiodothyronine or thyroxine (T4).
3. Therefore the thyroid gland is correct.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 16 Plant and Animal Hormones "Thyroid Gland", p.241_
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