Question

Match the following:

• A. A - III, B - I, C - IV, D - II
• B. A - I, B - III, C - IV, D - V
• C. A - II, B - IV, C - I, D - III
• D. A - III, B - I, C - V, D - IV

Hint:

Melatonin is often called the "Biological Clock" hormone.

Answer 1

The Correct Option is A

Step 1: Match Hormones to Functions:

• A. Melatonin: Secreted by the Pineal gland. Regulates the diurnal (24-hour) rhythm of the body, i.e., the Sleep-wake cycle (III).
• B. Thyroxine ($T_4$): Secreted by the Thyroid. Its primary function is regulating the Basal Metabolic Rate (BMR) (I) and body metabolism.
• C. Aldosterone: A mineralocorticoid from the Adrenal cortex. It acts on renal tubules to reabsorb $Na^+$ and water, maintaining Water-electrolyte balance (IV).
• D. Glucagon: Secreted by Alpha cells of Islets of Langerhans. It stimulates glycogenolysis and gluconeogenesis, increasing blood sugar, causing Hyperglycemia (II).

Step 2: Sequence:
A - III, B - I, C - IV, D - II. Matches Option (A).