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Practice · Biology · 2025 syllabus · A4.2

IB Biology A4.2 Conservation of biodiversity: practice questions

6 exam-style questions on A4.2 Conservation of biodiversity, SL and HL: 3 multiple choice, 1 data-based, 1 short answer and 1 extended response. Each one comes with the mark scheme, a model answer and the reasoning behind every mark. Free with your email.

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A4.2-01 · Paper 1A style · multiple choice · 1 mark

Conserving a species where it grows

A rare species of orchid now grows wild at only three sites, all in chalk grassland. Which measure is an example of in situ conservation of this orchid? [1]

  1. Grazing the grassland at the three sites so that shrubs do not grow up and shade out the orchids
  2. Collecting seeds from the wild plants and storing them, dried and frozen, in a seed bank
  3. Growing plants from seed in the glasshouses of a botanic garden
  4. Keeping samples of orchid tissue alive in sterile culture in a laboratory
Show the answer and the reasoning

Answer: A. In situ conservation protects a species in its natural habitat. Grazing keeps the grassland open, so the orchids stay where they grow naturally, along with the other species they interact with. B, C and D are all ex situ: the seed bank stores germ plasm, the botanic garden keeps living plants away from their habitat, and tissue culture keeps cells in a laboratory. These are valuable back-ups, but none of them protects the wild population or its habitat.

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The 6 questions in A4.2

  1. A4.2-01 Conserving a species where it growsPaper 1A style · multiple choice · 1 mark
  2. A4.2-02 How many species are there?Paper 1A style · multiple choice · 1 mark
  3. A4.2-03 Choosing an EDGE speciesPaper 1A style · multiple choice · 1 mark
  4. A4.2-04 Removing rats from an islandPaper 2 style · short answer · 6 marks
  5. A4.2-05 Measuring change after rewildingPaper 1B style · data-based · 9 marks
  6. A4.2-06 Genes, species and conservationPaper 2 style · extended response · 15 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.