- 30questions
- 55marks
- 47question parts
- 42micro-topics
What this paper tests
Mark distribution
- Interaction and interdependence27%
- Continuity and change20%
- Experimental and data skills20%
- Unity and diversity18%
- Form and function14%
Hardest areas (by marks)
Question types
- identify66%
- explain / justify15%
- write down / state6%
- sketch2%
2% of parts are show / prove.
Questions in this paper
Open a question to see what each part tests, how often that micro-topic comes up, and practise matched questions.
Where to go next
Explore topic pages
Every micro-topic in this paper, with its exam pattern and practice.
Browse Biology SL topicsPredicted questions
The likely question types in the next sitting, from the same data.
Predicted Paper 1Try a mock exam
A full paper under timed conditions with AI marking to IB criteria.
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Good to know
Can I download Biology SL November 2025 TZ1 Paper 1 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 TZ1 Paper 1?
Interaction and interdependence 27% (typical 22%), Continuity and change 20% (typical 25%), Experimental and data skills 20% (typical 12%).
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.
Want to practise the skills from this paper?
Open original Exam Vault questions matched by topic, marks and command term, with AI marking and step-by-step feedback.