Match List I with List II with respect to human eye.
List I — List II
A. Fovea — I. Visible coloured

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Question

Match List I with List II with respect to human eye.
List I — List II
A. Fovea — I. Visible coloured portion of eye that regulates diameter of pupil.
B. Iris — II. External layer of eye formed of dense connective tissue.
C. Blind spot — III. Point of greatest visual acuity or resolution.
D. Sclera — IV. Point where optic nerve leaves the eyeball and photoreceptor cells are absent.
Choose the correct answer from the options given below:

Accepted Answer

Correct Answer: D — A-III, B-I, C-IV, D-IIStep-by-step Solution:A. Fovea → III (Point of greatest visual acuity or resolution): The fovea centralis is a small depression (pit) at the centre of the macula lutea in the retina. It is densely packed exclusively with cone photoreceptors and contains no rods or blood vessels. It provides the sharpest, most detailed colour vision and represents the point of highest visual acuity — the image of whatever we look at directly falls on the fovea.B. Iris → I (Visible coloured portion that regulates pupil diameter): The iris is the pigmented, contractile, circular diaphragm located anterior to the lens. The pigment (melanin) in the iris determines eye colour. The circular and radial smooth muscle fibres of the iris regulate the size of the pupil — in bright light the circular muscles contract (pupil constricts); in dim light the radial muscles contract (pupil dilates).C. Blind spot → IV (Where optic nerve leaves and photoreceptors are absent): The optic disc (blind spot) is the point on the retina where the optic nerve (CN II) exits the eye and the central retinal artery/vein enter. There are no photoreceptors (neither rods nor cones) at this point, making it insensitive to light — creating the 'blind spot' in our visual field.D. Sclera → II (External dense connective tissue layer): The sclera is the outermost tough, opaque, white fibrous layer of the eyeball (the 'white of the eye'), composed of dense irregular connective tissue (collagen fibres). It maintains the shape of the eye, protects internal structures, and serves as the attachment site for extraocular muscles. It is continuous anteriorly with the transparent cornea.Key Concepts:Layers of eye: Fibrous coat (sclera + cornea) → Vascular coat/uvea (choroid + ciliary body + iris) → Retina (sensory layer).Photoreceptors: Rods (dim light/night vision, rhodopsin pigment) and Cones (colour vision, three types: S/M/L cones for blue/green/red).Fovea contains only cones; rods absent at fovea; rods most dense in peripheral retina.

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