Q. Which hormone /gland acts in biological clocks?
A) Thyroid
B) Thymus
C) Adrenal
D) Pineal
Explanation
Pineal gland secretes melatonin hormone. The concentration of this hormone in blood appears to flow a diurnal (day-night) cycle as it arises in the evening and through the night, it regulates working of gonads (testes and ovaries).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.