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Match List-I with List-II with respect to human eye.
Column I
- A. Fovea
- B. Iris
- C. Blind spot
- D. Sclera
Column II
- I. Visible coloured portion of eye that regulates diameter of pupil.
- II. External layer of eye formed of dense connective tissue.
- III. Point of greatest visual acuity or resolution.
- IV. Point where optic nerve leaves the eyeball and photoreceptor cells are absent.
Correct answer: A → III, B → I, C → IV, D → II
Explanation
The fovea gives greatest visual acuity, the iris is the coloured part, the blind spot lacks photoreceptors, and the sclera is dense connective tissue.
Detailed Solution
The fovea is a thinned-out portion of the retina where only the cones are densely packed. It is the point where the visual acuity (resolution) is the greatest. The visible coloured portion of the eye is iris. The diameter of the pupil is regulated by the muscle fibres of iris. Blind spot contains no photoreceptor cells. It is also a region where the optic nerves leave the eye and the retinal blood vessels enter it. The external layer of an eyeball is composed of a dense connective tissue and is called the sclera.