IB Biology HL · 2025
IB Biology HL past papers
875 past paper questions from 18 papers across 4 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.
HL archive · 2025 to 2026
IB Biology HL past papers
Latest exam session: May 2026
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Units in Biology HL
In syllabus order. The ring is the share of the marks each one carries.
Unit 1
Unity and diversity
19% of marks · 168 questions
- DueBase and amino acid sequences as the basis for constructing cladograms
- DueBarriers to hybridization and sterile interspecific hybrids
Unit 2
Form and function
23% of marks · 204 questions
Unit 3
Interaction and interdependence
26% of marks · 221 questions
Unit 4
Continuity and change
28% of marks · 224 questions
- DueConsequences of base substitutions
Unit 5
Experimental and data skills
5% of marks · 58 questions
- DueMean, standard deviation & error bars
Papers in Biology HL
Each paper across every sitting. The ring is the share of the marks it carries.
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 308 micro-topics for the next sitting. Numbers are questions per year.
fewermore
| Micro-topic | 2025 | 2026 |
|---|---|---|
3.6.1System integration | 14System integration, 2025: 14 questions | 11System integration, 2026: 11 questions |
| 11Interspecific relationships, 2025: 11 questions | 10Interspecific relationships, 2026: 10 questions | |
| 11Percentage change, ratios & rate from graphs, 2025: 11 questions | 1Percentage change, ratios & rate from graphs, 2026: 1 question | |
| 7Variation: the raw material, 2025: 7 questions | 4Variation: the raw material, 2026: 4 questions |
4 more micro-topics with a free account
- DueBase and amino acid sequences as the basis for constructing cladograms· last May 25 P2 TZ3
- 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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Frequently asked questions
Short answers about this page.
Which Biology HL exam sessions are covered?
4 exam sessions from 2025 to 2026, the latest May 2026. Every Paper 1 and 2 in every timezone is read and classified in full, which gives 18 papers in this archive.
Which IB Biology HL topic comes up most?
System integration (3.6.1): in 78% of papers, last seen May 26 P2 TZ3. Usually "Identify", worth about 2.8 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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What each Biology HL paper tests across all its sittings: the marks by unit and the micro-topics it keeps coming back to.
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