Which of the following are NOT under the control of thyroid hormone? A. Maintenance of water and electrolyte balance B. Regulation of basal metabolic rate C. Normal rhythm of sleep-wake cycle D. Development of immune system E. Support the process of R.B.Cs formation Choose the correct answer from the options given below:
Answer: (C) C and D only. Answer: (c) C and D only Solution: Thyroid hormones regulate basal metabolic rate (B), support red blood cell formation (E), and influence maintenance of water and electrolyte balance (A) — all under thyroid control.
- A.A and D only
- B.B and C only
- C.C and D only✓
- D.D and E only
Correct Answer
(C) C and D only
Solution & Explanation
Answer: (c) C and D only Solution: Thyroid hormones regulate basal metabolic rate (B), support red blood cell formation (E), and influence maintenance of water and electrolyte balance (A) — all under thyroid control. They do NOT control the normal sleep-wake rhythm (C, that is melatonin from the pineal) or the development of the immune system (D, that is thymus/thymosins). Hence C and D are not under thyroid hormone control. NCERT Reference: Chapter 19, Page 243, Line(s) 13-17 — "Thyroid hormones play an important role in the regulation of the basal metabolic rate. These hormones also support the process of red blood cell formation. Thyroid hormones control the metabolism of carbohydrates, proteins and fats. Maintenance of water and electrolyte balance is also influenced by thyroid hormones."