Questions: (B) The layer of the eyeball that contains the rods and cones. (C) The colored muscle portion of the eye that determines the size of the pupil. (D) The shape of this structure is determined by the ciliary muscles; it affects refraction of light. (E) Layer of the eyeball that provides the blood supply for the retina. (F) Secreted by the ciliary body and drained by the canal of Schlemm (G) Closes the eyelid (H) Secretes tears (I) Raises the eyelid (J) Color vision photoreceptors

To address the question, let's identify the structures or functions of the eye corresponding to each description:

(B) The layer of the eyeball that contains the rods and cones.

• The answer is the retina. The retina is the innermost layer of the eye, containing photoreceptor cells known as rods and cones, which are responsible for detecting light and color.

(C) The colored muscle portion of the eye that determines the size of the pupil.

• The answer is the iris. The iris is the colored part of the eye, and it contains muscles that adjust the size of the pupil to control the amount of light entering the eye.

(D) The shape of this structure is determined by the ciliary muscles; it affects refraction of light.

• The answer is the lens. The lens is a transparent structure in the eye that focuses light onto the retina. Its shape is adjusted by the ciliary muscles to change the focal distance, allowing the eye to focus on objects at various distances.

In summary, the answers are: (B) Retina (C) Iris (D) Lens