A) hormones
B) melanocytes
C) nervous system
D) Both and
Correct Answer: A
Solution :
Metachrosis is the condition of changing in skin colour, which protects frog from enemies. In lower animals like amphibians (frog), intermediate lobe of pituitary gland is well developed, which secretes melanocyte stimulating hormones. This hormone is responsible for metachrosis in lower animals. So, different colours of frog skin are controlled by hormones from intermediate lobe of pituitary gland.
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