Which one of the following pairs of organs includes only the endocrine glands?
- Thymus and testes
- Adrenal and ovary
- Parathyroid and adrenal
- Pancreas and parathyroid
Answer
(3) Parathyroid and adrenal
Solution
Testes and ovaries also produce gametes (exocrine function), and the pancreas is a composite (heterocrine) gland: its exocrine part secretes pancreatic juice.
As per NCERT, the parathyroid glands secrete parathyroid hormone (PTH) and the adrenal glands secrete adrenaline, noradrenaline and corticoids; both are purely endocrine.
∴ The pair 'parathyroid and adrenal' includes only endocrine glands.
Answer: (3)