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CIE · IGCSE · Co-ordinated Science (Double Award)

Inheritance, Variation and Ecology
Practice Questions

40 CIE IGCSE Co-ordinated Science (Double Award) questions on Inheritance, Variation and Ecology, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Inheritance, Variation and Ecology

Question 1 · 1 mark · Difficulty 1/3

Which statement correctly describes the role of mitosis in a multicellular organism?

  1. It produces two genetically identical daughter cells
  2. It produces four genetically identical daughter cells
  3. It produces two daughter cells with half the chromosome number
  4. It produces four daughter cells with half the chromosome number
Show answer & explanation
✓ Answer: A — It produces two genetically identical daughter cells
Mitosis produces two daughter cells that are genetically identical to the parent cell and to each other, maintaining the full chromosome number. Option D is incorrect because mitosis produces two, not four, daughter cells. Option B describes meiosis in terms of chromosome number reduction. Option C describes the outcome of meiosis, not mitosis.
Question 2 · 1 mark · Difficulty 1/3

Which of the following best describes a gene?

  1. A pair of alleles located on homologous chromosomes
  2. A section of DNA that codes for a specific protein
  3. The complete set of chromosomes in a cell nucleus
  4. A thread-like structure found in the cell nucleus
Show answer & explanation
✓ Answer: B — A section of DNA that codes for a specific protein
A gene is a section of DNA that codes for a specific protein (or polypeptide). Option B describes a genome or karyotype rather than a gene. Option C describes a chromosome. Option D describes an allele pair, not a gene itself.
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CIE IGCSE Co-ordinated Science (Double Award): Inheritance, Variation and Ecology FAQ

Is Kramizo free for CIE IGCSE students preparing for Co-ordinated Science (Double Award)?
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 Inheritance, Variation and Ecology practice with other Co-ordinated Science (Double Award) topics or even switch to a totally different CIE 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 Inheritance, Variation and Ecology questions aligned to the official CIE IGCSE Co-ordinated Science (Double Award) syllabus?
Every question is written against the published CIE IGCSE Co-ordinated Science (Double Award) specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE 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 CIE.
How is Inheritance, Variation and Ecology typically tested on CIE IGCSE Co-ordinated Science (Double Award) papers?
Inheritance, Variation and Ecology appears across multiple question types on real CIE IGCSE Co-ordinated Science (Double Award) 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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