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Very short answer type.
Is pineal gland a vestigial organ? Mention its functions.

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Solution

No, pineal gland is an endocrine gland, which secretes the hormone melatonin. This hormone produces circadian rhythms and regulates sleep cycle of the body.

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The faulty functioning of an endocrine gland can make a person very short or very tall. This gland is

(a) thyroid

(b) pineal

(c) adrenal

(d) pituitary

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