IB Biology SL · 2025
IB Biology SL past papers
440 past paper questions from 12 papers across 3 exam sessions. See what repeats, then practise the same skills with AI marking.
Starter set across the most-tested skills, with AI marking and model answers.
SL archive · from 2025
IB Biology SL past papers
Latest exam session: November 2025
- questions
- 440
- questions
- papers
- 12
- papers
- exam sessions
- 3
- exam sessions
- micro-topics
- 148
Units in Biology SL
In syllabus order. The ring is the share of the marks each one carries.
Unit 1
Unity and diversity
16% of marks115 of the 714 marks across the 12 Biology SL papers analysed (16%) were on this unit. A past-paper pattern, not a guarantee for your next paper. · 72 questions
Unit 2
Form and function
22% of marks160 of the 714 marks across the 12 Biology SL papers analysed (22%) were on this unit. A past-paper pattern, not a guarantee for your next paper. · 96 questions
- DueAmino acid structure
Unit 3
Interaction and interdependence
20% of marks143 of the 714 marks across the 12 Biology SL papers analysed (20%) were on this unit. A past-paper pattern, not a guarantee for your next paper. · 93 questions
Unit 4
Continuity and change
24% of marks172 of the 714 marks across the 12 Biology SL papers analysed (24%) were on this unit. A past-paper pattern, not a guarantee for your next paper. · 90 questions
Unit 5
Experimental and data skills
17% of marks124 of the 714 marks across the 12 Biology SL papers analysed (17%) were on this unit. A past-paper pattern, not a guarantee for your next paper. · 89 questions
Papers in Biology SL
Each paper across every sitting. The ring is the share of the marks it carries.
6 sittings · calculator
Paper 1
46% of marks328 of the 714 marks in the Biology SL archive were set in Paper 1, across 6 sittings. · 280 questions
Most tested Reading & interpreting graphs, charts & tables
6 sittings · calculator
Paper 2
54% of marks386 of the 714 marks in the Biology SL archive were set in Paper 2, across 6 sittings. · 160 questions
Most tested Reading & interpreting graphs, charts & tables
Exam pattern
How often each micro-topic has been examined, year by year. Each label is explained under the grid.
Does it repeat?
Top 4 of 148 micro-topics for the next sitting. Numbers are questions per year.
fewermore
| Micro-topic | 2025 |
|---|---|
| 34Reading & interpreting graphs, charts & tables, 2025: 34 questions | |
| 8Reliability, replicates & evaluating method, 2025: 8 questions | |
| 8Speciation and reproductive isolation, 2025: 8 questions | |
| 8Percentage change, ratios & rate from graphs, 2025: 8 questions |
4 more micro-topics with a free account
- DueAmino acid structure· last Spec 25 P2
- Dueusually examined, but missing from the last two exam sessions
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Every micro-topic in the heatmap and the complete watch list, free with an account.
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Every Biology SL exam session
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Frequently asked questions
Short answers about this page.
Which Biology SL exam sessions are covered?
3 exam sessions from 2025, the latest November 2025. Every Paper 1 and 2 in every timezone is read and classified in full, which gives 12 papers in this archive.
Which IB Biology SL topic comes up most?
Reading & interpreting graphs, charts & tables (5.1.4): in 100% of papers, last seen Nov 25 P2 TZ3. Usually "explain / justify", worth about 4.3 marks in a paper that includes it.
Can I see the original question and mark scheme?
No. The wording belongs to the IB. You get the citation, the marks, the command term and the skill tested, plus our own matched practice questions with worked answers and AI marking.
What do "banker", "due" and "rising" mean?
Banker: examined in at least one sitting in four and still appearing. Due: regular before, but absent for the last two exam sessions. Rising: clearly more common in the last two years. Our classification of real papers, not an IB statistic.
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Reading this page and the exam pattern is free. A free account generates three sets of ten questions and launches one practice set. Pro opens every question in any scope, sets of twenty or all, and unlimited practice.
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More Biology SL exam preparation
Every question, by paper
What each Biology SL paper tests across all its sittings: the marks by unit and the micro-topics it keeps coming back to.
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Predicted questions
The question types most likely in the next Biology SL sitting, built from this same archive.
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Formula booklet, explained
Every formula you are given in the exam, with when to use it and the traps around it.
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Mock exams
Full Biology SL papers under timed conditions, marked by AI against IB criteria.
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All IB past papers
Every subject we have classified by topic, with the same exam-pattern analysis.
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