In the given figure of eye, few parts are labelled as and . Select the option which shows the correct identification of the part with its characteristics.
Iris, it is responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.
— Concept: This question tests your knowledge of the anatomy of the human eye and the specific functions of its various…Concept: This question tests your knowledge of the anatomy of the human eye and the specific functions of its various parts.
Why (B) is correct: Part 2 points to the iris. The iris is indeed responsible for controlling the diameter and size of the pupil, thereby regulating the amount of light entering the eye and reaching the retina. This is a crucial function for vision in varying light conditions.
Why other options are wrong:
- (A) 1 points to the retina, not the choroid. The retina contains photoreceptor cells, bipolar cells, and ganglion cells, but the choroid is a vascular layer.
- (C) 3 points to the fovea/macula lutea, not the blind spot. The blind spot is where the optic nerve leaves the eye and lacks photoreceptors.
- (D) 4 points to the lens, not the cornea. The cornea is the outermost transparent layer at the front of the eye.
Common Mistake: Students often confuse the functions and locations of the macula lutea, fovea, and blind spot, as well as the lens and cornea.
NEET Tip / Mnemonic: Remember that the Iris Controls the Pupil (ICP) to regulate light. The Lens Focuses Light (LFL).
Correct Answer: (B)
Iris, it is responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.