In the mammalian eye, the 'fovea' is the center of the visual field, where

Which of the following statements are correct regarding the fovea?
$I -$ The central pit of the macula lutea is called the fovea.
$II -$ The fovea is a thinned-out portion of the retina.
$III -$ The fovea contains densely packed rods.
$IV -$ Visual acuity is highest in the fovea region.

Which one of the following is the correct difference between rod cells and cone cells of our retina?

The visual pigment in the rods of the retina of the vertebrate eye,which is responsible for the detection of light,is:

The pecten,a comb-like structure,is found in the eye of which of the following?

What is the function of cone cells?