IB past paper analysis
Biology SL
May 2025 · Paper 1 · TZ1
See what this paper tests, focus on the skills that carry the marks, and practise matched Exam Vault questions with AI marking.
- 30questions
- 55marks
- 48question parts
- 42micro-topics
Mark distribution
- Interaction and interdependence24%
- Continuity and change24%
- Experimental and data skills20%
- Form and function18%
- Unity and diversity14%
Hardest areas (by marks)
Question types
- other63%
- explain / justify13%
- write down / state6%
- outline6%
0% 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.
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.
Original Exam Vault questions with AI markscheme feedback for this topic.
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 1Good to know
Can I download Biology SL May 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 May 2025 TZ1 Paper 1?
Interaction and interdependence 24% (typical 20%), Continuity and change 24% (typical 24%), Experimental and data skills 20% (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.