IB past paper analysis

Biology HL
May 2025 · Paper 2 · TZ1

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  • 10questions
  • 93marks
  • 39question parts
  • 29micro-topics

What this paper tests

Mark distribution

  • Continuity and change28%
  • Interaction and interdependence26%
  • Unity and diversity18%
  • Form and function16%
  • Experimental and data skills12%

Hardest areas (by marks)

  1. 1.Homeostasis & negative feedback7 marks
  2. 2.Regulation of transcription by proteins that bind to specific base sequences in DNA7 marks
  3. 3.Adaptive immunity, antibodies and memory7 marks

Question types

explain / justify: 44%write down / state: 18%label: 8%outline: 8%3%
  • explain / justify44%
  • write down / state18%
  • label8%
  • outline8%

3% of parts are show / prove.

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Questions in this paper

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Where to go next

Good to know

Can I download Biology HL May 2025 TZ1 Paper 2 here?

No. The paper and its mark scheme belong to the IB and are not reproduced. This page gives the structure of every question (marks, command term, micro-topic, the skill tested), the exam analysis, and practice questions we wrote to test the same skills. Subscribers can also open our summary of how each part's marks are awarded.

Which topics dominate May 2025 TZ1 Paper 2?

Continuity and change 28% (typical 28%), Interaction and interdependence 26% (typical 26%), Unity and diversity 18% (typical 19%).

How do I practise this paper without the paper?

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