Answer : The correct options are, (a) sclera, (b) pupil, (c) iris and (d) cornea.
Explanation :
As we know that an eye classified into two categories which are external structure and internal structure.
External structure of an eye : It is the part of an eye which are visible externally.
The external part of an eye includes sclera, conjunctiva, cornea, iris and pupil.
Internal structure of an eye : It is the part of an eye which are nor visible externally.
The internal part of eye includes lens, retina, optic nerve.
Hence, from the above information, we conclude that the outer part of the eye consists of the sclera, cornea, iris and pupil.
