IB Biology SL · 2025
Unit 2: Form and function
149 past paper questions from 18 papers across 4 exam sessions. See what repeats, then practise the same skills with AI marking.
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SL archive · 2025 to 2026
Unit 2: Form and function
Latest exam session: May 2026
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Topics in Unit 2: Form and function
In syllabus order. The ring is the share of the marks each one carries.
2.1
Carbohydrates and lipids
19% of marks · 28 questions
- DueStructure of cellulose related to its function in plant cell walls
2.2
Proteins
5% of marks · 9 questions
2.3
Membranes and membrane transport
10% of marks · 13 questions
2.4
Organelles and compartmentalization
5% of marks · 9 questions
2.5
Cell specialization
4% of marks · 9 questions
2.6
Gas exchange
17% of marks · 25 questions
2.7
Transport
16% of marks · 18 questions
2.9
Adaptation to environment
14% of marks · 19 questions
2.10
Ecological niches
10% of marks · 19 questions
- DueCompetitive exclusion and the uniqueness of ecological niches
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 62 micro-topics for the next sitting. Numbers are questions per year.
fewermore
| Micro-topic | 2025 | 2026 |
|---|---|---|
| 5Organelles as discrete subunits of cells adapted to specific functions, 2025: 5 questions | 3Organelles as discrete subunits of cells adapted to specific functions, 2026: 3 questions | |
| 3Adaptations of organisms to the abiotic environment of their habitat, 2025: 3 questions | 2Adaptations of organisms to the abiotic environment of their habitat, 2026: 2 questions | |
| 4Structure of cellulose related to its function in plant cell walls, 2025: 4 questions | ·Structure of cellulose related to its function in plant cell walls, 2026: 0 questions | |
| 3Competitive exclusion and the uniqueness of ecological niches, 2025: 3 questions | ·Competitive exclusion and the uniqueness of ecological niches, 2026: 0 questions |
4 more micro-topics with a free account
- 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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Questions on Unit 2: Form and function, by exam session
Which papers asked about Unit 2: Form and function, and which question numbers. Open a paper to see them highlighted.
May 2026
37 questions across 6 papers
November 2025
23 questions across 4 papers
May 2025
37 questions across 6 papers
Specimen 2025
10 questions across 2 papers
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Frequently asked questions
Short answers about this page.
Which Biology SL exam sessions are covered for Unit 2: Form and function?
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 Unit 2: Form and function topic comes up most?
Organelles as discrete subunits of cells adapted to specific functions (2.4.1): in 39% of papers, last seen May 26 P1 TZ2. Usually "Identify", worth about 1.4 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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