Mark the incorrect statement 1) Sclera is composed of dense connective tissue2) The choroid layer is think in the anterior part in comparison to posterior 2/3 of eyeball3) Retina contains three layer of cells and from outside to inside it is ganglionic cells, bipolar cells and photoreceptor cells4) The diameter of pupil is regulate by muscle fibres of iris

Sclera consists of Dense connective tissue primarily made of collagen fibre bundles- so option 1 is correct.
Choroid layer is thin, soft, brown vascular lining thicker at posterior and thinner at anterior portion. So its correct
Option 4 is also correct.
Option 3 is incorrect- As retina has 3 layers but outside layer is photoreceptors, middle layer is Bipolar cells and innermost ganglionic cell layer