A) hypothalamus
B) pituitary
C) thymus
D) thyroid
Correct Answer: D
Solution :
Thyroid gland secretes three hormones : (i) Thyroxine, (ii) Tri-iodothyronine (iii) Calcitonin. Thyroid gland is stimulated to secrete its hormone by a pituitary gland hormone TSH (Thyroid Stimulating Hormone). Thyroxine increases BMR (Basal Metabolic Rate) and stimulates growth, tissue differentiation and metamorphosis of tadpoles into adult frog.
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