Which of the following controls the aperture of pupil?

The correct answer is iris.

Key Points

• The iris is the colored part of the eye that controls the size of the pupil.
• It functions by using muscles to constrict or dilate the pupil, regulating the amount of light entering the eye.
• The iris is composed of two layers: the stroma and the pigmented epithelial cells.
• Its primary function is to adjust the pupil size in response to changing light conditions.
• In bright light, the iris contracts, making the pupil smaller to allow less light in, and in low light, it dilates the pupil to allow more light in.
• This process helps in protecting the retina and improving vision clarity.

 Additional Information

• Conjunctiva
  • The conjunctiva is a thin, transparent tissue that covers the white part of the eye and the inside of the eyelids.
  • It helps in keeping the eye moist and protecting it from dust and microorganisms.
• Cornea
  • The cornea is the clear, dome-shaped surface that covers the front of the eye.
  • It plays a key role in focusing visual images onto the retina.
• Dark Room
  • A dark room is a room designed to be completely dark, typically used for developing photographic film or conducting experiments.
  • It has no direct connection to the physiological control of the pupil.