_____________ is an aperture which controls light passage in the eye.

Correct option is D

The correct answer is (d) Pupil.
· The pupil is the aperture in the eye that controls the passage of light.
· It adjusts its size based on light conditions, expanding in low light to allow more light in and contracting in bright light to reduce light entry.
Information Booster:
· Blind Spot: The point on the retina where the optic nerve exits the eye; it lacks photoreceptors.
· Sclerotic coat: Also known as the sclera, it is the white, protective outer layer of the eye.
· Iris: The colored part of the eye surrounding the pupil; it controls the size of the pupil and, consequently, the amount of light entering the eye.