Q. The hormone that regulates the rhythm of life is

A
Prolactin
B
Auxin
C
Cortisol
D
Melatonin
Solution:

Blood levels of the pineal hormone melatonin are high at night and low during the day. Its secretion is regulated by a rhythm-generating system located in the suprachiasmatic nucleus of the hypothalamus, which is in turn regulated by light.

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