A) anger
B) body temperature
C) colouration of skin
D) sleep
Correct Answer: C
Solution :
Pineal gland secretes two hormones- melatonin and serotonin. Melatonin concentration in the blood appears to flow a diurnal cycle as it arises in the evening and through the night drops, to a low around noon. It lightiens skin colour in certain animals and regulates working of gonads (testes and ovaries). Light falling on the retina of eye decreases melatonin production, darkness stimulates melatonin synthesis.
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