In the human eye,the bipolar cells are present in:

The density of the vitreous humour is approximately equal to that of the:

Only rods are present in the eyes of one of the following animals:

Read the following statements with respect to the human eye and select the correct option.
Statement $I$: Uvea is the middle,vascular,and non-pigmented layer of the eye that lies outer to the retina.
Statement $II$: The size of the lens can be adjusted depending on the distance of the object from the eye,through the muscles of the ciliary body and the suspensory ligament.

The middle layer of the human eye,the choroid,contains $A$ and looks $B$ in color. Choose the correct option for $A$ and $B$.

Which pigment helps some nocturnal animals to see during the night?