State the functions of the following :​
(iv) Iris

Q. State the function of each of the following parts of human eye ;-
(a)Cornea
(b)Iris

Q. Name the following :​
(iv) The circular opening enclosed by iris

Q. Given below is an example of certain structures and their special functional activities :
For example : Eye and vision. On a similar pattern complete the following :
(i) Neutrophils : ___________________________
(ii) Ureter : _______________________________
(iii) Neurotransmitters : _____________________
(iv) Iris of the eye : ________________________
(v) Placenta : ____________________________