Question

The central aperture of ………….. is called ………….
(A) Iris, Pupil
(B) Pupil, Iris
(C) Retina, Iris
(D) none

Answer 1

Hint The Iris is an entire physical tissue sited behind the cornea. The pupil is not a tangible part of the eye that is to say not a structure of the eye. An aperture simply means a small hole.

Complete step by step answer
The eye is considered an organ for vision in many living things. In most mammals, the eye helps us to navigate the surrounding by feeding us information on location, colour, and movement of an object.
The eye is an intricately designed organ, which has many parts functioning in accordance for the purpose of this said vision. The parts of the eye include but are not limited to the cornea, the lens, the iris, the retina, and the pupil.
The cornea is the first outer layer of the eye, which receives the incoming ray of light and acts to focus it. Non parallel rays or diverging rays are first made parallel by the cornea so it can be focused properly by the lens.
Right behind the cornea, we have the anterior chamber which holds the fluids produced by the eyes. Right after that sits the iris which is a ring of tissue designed to regulate the amount of light incident on the lens by varying the area of the hole of the ring. It also determines the overall colour of the eye. The hole surrounded by the ring of the iris is called the pupil. The pupil appears black because it has no physical structure and allows light to pass through to be absorbed by the retina after being focused by the lens.
Hence, from these descriptions, since an aperture is simply a hole (that is small), we can conclude that the central circular aperture of the Iris is called the Pupil.
So the correct answer is option A.

Note
The camera is an invention which works similarly to the eye. The diaphragm of the camera is analogous to the iris, the aperture is analogous to the Pupil, the film the retina, and they both have lenses. However, since one is a biological object, another a mechanical one, differences abound.