Harderian glands are absent in

The muscles of the iris and ciliary body are derived from the:

The sclera is the external covering of the eye which:

The eyes of cat, cow, buffalo and some nocturnal animals shine in the night. It is due to the presence of $tapetum \text{ } lucidum$ between the choroid and retina. This shining is due to the presence of a pigment made of:

The retinal blood vessels enter the eye at

The pupil becomes bigger to allow more light during dark by the: