IB past paper analysis

Biology SL
November 2025 · Paper 2 · TZ3

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  • 7questions
  • 64marks
  • 26question parts
  • 22micro-topics

Mark distribution

  • Form and function36%
  • Unity and diversity28%
  • Experimental and data skills17%
  • Interaction and interdependence9%
  • Continuity and change9%

Hardest areas (by marks)

  1. 1.Speciation and reproductive isolation7 marks
  2. 2.Plant transport: xylem & transpiration7 marks
  3. 3.Monosaccharides and disaccharides5 marks

Question types

explain / justify: 46%outline: 15%write down / state: 12%distinguish: 8%0%
  • explain / justify46%
  • outline15%
  • write down / state12%
  • distinguish8%

0% of parts are show / prove.

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Questions in this paper

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Explore topic pages

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Predicted questions

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Good to know

Can I download Biology SL November 2025 TZ3 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 November 2025 TZ3 Paper 2?

Form and function 36% (typical 22%), Unity and diversity 28% (typical 16%), Experimental and data skills 17% (typical 17%).

How do I practise this paper without the paper?

Press "Practise similar" on any question. We open questions matched by micro-topic, command term and mark range with model answers and AI marking, then bring you back here.