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CXC · CSEC · Biology

Natural Selection and Evolution
Practice Questions

20 CXC CSEC Biology questions on Natural Selection and Evolution, each with instant feedback and a full examiner-style mark scheme.

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Question 1 · 1 mark · Difficulty 1/3

A population of Anolis lizards on a small Caribbean island was studied over 15 years. After a hurricane destroyed most low-lying vegetation, researchers observed that lizards with longer legs became more common. Which term BEST describes this process?

  1. Genetic engineering
  2. Natural selection
  3. Artificial selection
  4. Spontaneous generation
Show answer & explanation
✓ Answer: BNatural selection
Award 1 mark for identifying natural selection as the process where organisms with advantageous traits survive and reproduce more successfully. A is incorrect — genetic engineering involves deliberate human manipulation of genes. C is incorrect — artificial selection requires human choice of breeding organisms. D is incorrect — spontaneous generation is a disproven theory about life arising from non-living matter.
Question 2 · 1 mark · Difficulty 1/3

Which scientist is credited with proposing the theory of evolution by natural selection after studying organisms in the Galápagos Islands?

  1. Gregor Mendel
  2. Charles Darwin
  3. Louis Pasteur
  4. Jean-Baptiste Lamarck
Show answer & explanation
✓ Answer: BCharles Darwin
Award 1 mark for identifying Darwin. A is incorrect — Mendel studied inheritance in pea plants. C is incorrect — Pasteur worked on germ theory and pasteurisation. D is incorrect — Lamarck proposed inheritance of acquired characteristics, a different evolutionary mechanism.
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CXC CSEC Biology: Natural Selection and Evolution FAQ

How many CXC CSEC Biology questions on Natural Selection and Evolution are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Natural Selection and Evolution 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 Natural Selection and Evolution 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 Natural Selection and Evolution 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 Natural Selection and Evolution typically tested on CXC CSEC Biology papers?
Natural Selection and Evolution 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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