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Q.

Sleep-wake cycle is maintained by the secretion of

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a

thymus

b

thyroid

c

pineal

d

adrenal

answer is C.

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Detailed Solution

The pineal gland is located on the dorsal side of forebrain secretes a hormone called melatonin. It helps in maintaining the normal rhythms of sleep-wake cycle, body temperature. In addition, melatonin also influences metabolism, pigmentation, the menstrual cycle as well as our defense capability. 

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