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MSH of pars intermedia of middle pituitary is responsible for

1. darkening of skin in lower vertebrates
2. light colouration of skin in lower vertebrates
3. not A and B
4. darkening of skin in human beings

Correct answer: darkening of skin in lower vertebrates

Solution

MSH (melanocyte-stimulating hormone) from the pars intermedia causes dispersion of melanin in lower vertebrates, leading to darker skin. In humans, this lobe is rudimentary, so this classic effect is mainly seen in lower vertebrates.

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