Question

define Iris
answer it properly

Answer 1

it is a circular dark diaphragm having a hole in it's centre.the hole is called pupil the circular dark diaphragm has muscles and coloured pigments

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Answer 2

In humans and most mammals and birds, the iris (plural : irides or irises ) is a thin , circular structure in the eye , responsible for controlling the diameter and size of the pupil and thus the amount of light reaches the retina . Eye colour is defined by that of the iris .