The nictitating membrane, also known as the $Plica \text{ } semilunaris$, is a vestigial organ present in which part of the human eye?

The iodopsin which is in cones is sensitive for

The small portion of the retina that contains only cones is called.....

Myopia (near-sightedness) in the human eye is a defect in which the image is formed...

Good vision depends on adequate intake of carotene-rich food. Select the best option from the following statements:
$(1)$ Vitamin $A$ derivatives are formed from carotene.
$(2)$ The photopigments are embedded in the membrane discs of the inner segment.
$(3)$ Retinal is a derivative of vitamin $A$.
$(4)$ Retinal is a light-absorbing part of all the visual photopigments.

The sensory pigmented layer of the eye is known as: