Q161 / 200 · NEET 2023 (All India) · Zoology

Match List I with List II: 

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: 

  • A
    A-II, B-I, C-III, D-IV
  • Correct answer
    B
    A-III, B-I, C-IV, D-II
  • C
    A-IV, B-III, C-II, D-I
  • D
    A-I, B-IV, C-III, D-II

Solution

Fovea
  • At the posterior pole of the eye lateral to the blind spot, there is a yellowish pigmented spot called macula lutea with a central pit called the fovea.
  • The fovea is a thinned-out portion of the retina where only the cones are densely packed. It is the point where the resolution is the greatest.
Iris
  • The continuation of the ciliary body forward to form a pigmented and opaque structure called the iris which is the visible coloured portion of the eye.
Blind spot
  • The optic nerves leave the eye and the retinal blood vessels enter it at a point medial to and slightly above the posterior pole of the eyeball. 
  • Photoreceptor cells are not present in that region and hence it is called the blind spot.
Sclera
  • The external layer or our eye is composed of a dense connective tissue and is called the sclera, which has cornea, choroid and retina.

Hence, the correct answer is option: 'B'.

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