IB Biology SL · 2025
Unit 2: Form and function
94 past paper questions from 12 papers across 3 exam sessions. See what repeats, then practise the same skills with AI marking.
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SL archive · from 2025
Unit 2: Form and function
Latest exam session: November 2025
- questions
- 94
- questions
- papers
- 12
- papers
- exam sessions
- 3
- exam sessions
- micro-topics
- 37
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
18% of marks29 of the 158 marks across the 12 Biology SL papers analysed (18%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 17 questions
2.2
Proteins
4% of marks7 of the 158 marks across the 12 Biology SL papers analysed (4%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 6 questions
- DueAmino acid structure
2.3
Membranes and membrane transport
13% of marks21 of the 158 marks across the 12 Biology SL papers analysed (13%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 14 questions
2.4
Organelles and compartmentalization
5% of marks8 of the 158 marks across the 12 Biology SL papers analysed (5%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 5 questions
2.5
Cell specialization
6% of marks10 of the 158 marks across the 12 Biology SL papers analysed (6%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 8 questions
2.6
Gas exchange
8% of marks13 of the 158 marks across the 12 Biology SL papers analysed (8%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 10 questions
2.7
Transport
20% of marks32 of the 158 marks across the 12 Biology SL papers analysed (20%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 13 questions
2.9
Adaptation to environment
18% of marks29 of the 158 marks across the 12 Biology SL papers analysed (18%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 15 questions
2.10
Ecological niches
6% of marks9 of the 158 marks across the 12 Biology SL papers analysed (6%) were on this topic. A past-paper pattern, not a guarantee for your next paper. · 6 questions
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 37 micro-topics for the next sitting. Numbers are questions per year.
fewermore
| Micro-topic | 2025 |
|---|---|
| 7Plant transport: xylem & transpiration, 2025: 7 questions | |
| 6Polysaccharides: structure and function, 2025: 6 questions | |
| 5Blood vessels: arteries, veins & capillaries, 2025: 5 questions | |
| 6Plant adaptations to the environment, 2025: 6 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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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.
November 2025
21 questions across 4 papers
May 2025
33 questions across 6 papers
Specimen 2025
10 questions across 2 papers
Every Unit 2: Form and function question, unlocked
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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?
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 Unit 2: Form and function topic comes up most?
Plant transport: xylem & transpiration (2.7.4): in 50% of papers, last seen Nov 25 P2 TZ3. Usually "other", worth about 3.2 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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