In man, the nictitating membrane is

Absent

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Vestigial

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Non-functional

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Functional

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Solution

The correct option is A Vestigial
The plica semilunaris in humans is a small fold of tissue on the inside corner of the eye. It is the vestigial remnant of the nictitating membrane, an organ that is fully functional in some other species of mammals.

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Similar questions

Which of the following is the correct group of vestigial organs in man ?

a) Nictitating membrane, ear muscles, eyelids and coccyx

b) Appendix, coccyx, ear muscles and elbow joint

c) Wisdom tooth, coccyx, body hair and ear muscles

d) Wisdom tooth, body hair, Nictitating membrane and vermiform appendix

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