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HomeCXC CSEC BiologyThe Human Eye – Structure, Function and Common Defects
CXC · CSEC · Biology

The Human Eye – Structure, Function and Common Defects
Practice Questions

20 CXC CSEC Biology questions on The Human Eye – Structure, Function and Common Defects, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on The Human Eye – Structure, Function and Common Defects

Question 1 · 1 mark · Difficulty 1/3

Which part of the human eye is responsible for refracting light rays to focus them on the retina?

  1. Iris
  2. Cornea
  3. Sclera
  4. Choroid
Show answer & explanation
✓ Answer: BCornea
Award 1 mark for identifying the cornea as the main refracting structure. A is incorrect — the iris controls the amount of light entering the eye. C is incorrect — the sclera is the protective outer layer. D is incorrect — the choroid contains blood vessels and absorbs stray light.
Question 2 · 1 mark · Difficulty 1/3

Which type of lens is used to correct myopia?

  1. Convex lens
  2. Concave lens
  3. Cylindrical lens
  4. Bifocal lens
Show answer & explanation
✓ Answer: BConcave lens
Award 1 mark for identifying concave/diverging lens. A is incorrect — convex lenses are used for hypermetropia. C is incorrect — cylindrical lenses correct astigmatism. D is incorrect — bifocals combine two prescriptions but are not specifically for myopia alone.
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20 questions · 25 min · free

CXC CSEC Biology: The Human Eye – Structure, Function and Common Defects FAQ

How many CXC CSEC Biology questions on The Human Eye – Structure, Function and Common Defects are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on The Human Eye – Structure, Function and Common Defects for CXC CSEC Biology, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CXC paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CXC CSEC students preparing for Biology?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix The Human Eye – Structure, Function and Common Defects practice with other Biology topics or even switch to a totally different CXC subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the The Human Eye – Structure, Function and Common Defects questions aligned to the official CXC CSEC Biology syllabus?
Every question is written against the published CXC CSEC Biology specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CXC.
How is The Human Eye – Structure, Function and Common Defects typically tested on CXC CSEC Biology papers?
The Human Eye – Structure, Function and Common Defects appears across multiple question types on real CXC CSEC Biology papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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