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Practice · Biology · 2025 syllabus · A3.1

IB Biology A3.1 Diversity of organisms: practice questions

6 exam-style questions on A3.1 Diversity of organisms, SL and HL, 1 marked HL: 3 multiple choice, 2 data-based and 1 short answer. Each one comes with the mark scheme, a model answer and the reasoning behind every mark. Free with your email.

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A3.1-01 · Paper 1A style · multiple choice · 1 mark

Reading binomial names

The lion is Panthera leo, the tiger is Panthera tigris and the cheetah is Acinonyx jubatus. What can be deduced from these names? [1]

  1. The lion and the tiger belong to the same species.
  2. The lion and the cheetah belong to the same genus.
  3. The second part of each name identifies the genus.
  4. The lion and the tiger belong to the same genus.
Show the answer and the reasoning

Answer: D. In a binomial name the first part (capital letter) is the genus and the second part (lower case) distinguishes the species. Lion and tiger share the genus name Panthera. A is wrong because their second names differ, so they are different species. B is wrong because the cheetah is in a different genus, Acinonyx. C reverses the rule: the genus is the first part.

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The 6 questions in A3.1

  1. A3.1-01 Reading binomial namesPaper 1A style · multiple choice · 1 mark
  2. A3.1-02 Limits of the species conceptPaper 1A style · multiple choice · 1 mark
  3. A3.1-03 Where one species endsPaper 1A style · multiple choice · 1 mark
  4. A3.1-04 Falling cost of genome sequencingPaper 2 style · short answer · 7 marks
  5. A3.1-05 Fish DNA in river waterPaper 1B style · data-based · 8 marks · HL
  6. A3.1-06 Karyograms and human chromosome 2Paper 1B style · data-based · 9 marks

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Every Biology and Chemistry question here is original, written for practice in the style of the papers set since the 2025 syllabus, with invented data. Developed independently from the International Baccalaureate Organization, which has not endorsed it. Found a mistake? Email vytis@limeadmissions.com with the question id.