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Byju's Answer
Standard XII
Biology
CNS
Photoperiods ...
Question
Photoperiods are believed to be perceived by
A
Hypothalamus
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B
Pineal body
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C
Pituitary gland
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D
Thyroid
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Solution
The correct option is
B
Pineal body
Photoperiodism is the physiological reaction to the length of day or night by an organism.
The pineal gland or pineal body (epiphysis or third eye) is a small endocrine gland.
It secretes melatonin (hormone) which regulates the wake/sleep patterns and photoperiodic functions.
So, the correct answer is 'Pineal body'.
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