Which part of the eye is referred to as the colored portion?

The iris is the part of the eye responsible for its color and is located between the cornea and the lens. Its primary function is to control the amount of light that enters the eye by adjusting the size of the pupil, which is the opening in the center of the iris. The different colors of the iris are due to variations in the amount and distribution of melanin, which is a pigment.

The other options pertain to different components of the eye. The choroid is a layer of blood vessels and connective tissue that provides nourishment to the retina but does not contribute color to the eye. The lens is a transparent structure that helps to focus light onto the retina and is not colored. The cornea is the clear front layer of the eye that helps to focus light as well but also does not contain color. Therefore, the iris is distinctly recognized as the colored portion, making it the correct answer.