Biological termHard1 mark
1(a)
Name the following:
The layer of the eyeball that forms the transparent cornea.
Topic: Sclera
Previous-year question practice database
Answer
Exam answer
The SCLERA (sclerotic layer).
Explanation
The CORNEA is not a separate layer but the TRANSPARENT FRONT PORTION of the sclera — which is exactly what the question is testing.
The three concentric layers, and what each becomes at the front of the eye: SCLERA — tough and protective; its front part becomes the transparent CORNEA CHOROID — vascular and pigmented; continues forward as the CILIARY BODY and the IRIS RETINA — light-sensitive, containing the rods and cones
Seeing that the cornea, ciliary body and iris are CONTINUATIONS of the outer two layers ties several questions together — including the 2025 paper’s question on the ciliary body and the 2019 paper’s on the choroid.
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