IB Diploma
IB Diploma Biology HL (BIO-HL) Past Papers & Mark Schemes
Free IB Diploma Biology HL (BIO-HL) past papers from 2025 to 2025, each with its mark scheme, plus past-paper questions regrouped by syllabus topic. View or download every PDF without an account.
BIO-HL past papers
21 papers
BIO-HL 2025 past papers
21 papers
November 2025
Paper 1A · TZ1
November 2025
Paper 1A · TZ3
November 2025
Paper 1B · TZ1
November 2025
Paper 1B · TZ3
November 2025
Paper 2 · TZ1
November 2025
Paper 2 · TZ3
May 2025
Paper 1A · TZ1
May 2025
Paper 1A · TZ2
May 2025
Paper 1A · TZ3
May 2025
Paper 1A · TZA
May 2025
Paper 1B · TZ1
May 2025
Paper 1B · TZ2
May 2025
Paper 1B · TZ3
May 2025
Paper 1B · TZA
May 2025
Paper 2 · TZ1
May 2025
Paper 2 · TZ2
May 2025
Paper 2 · TZ3
May 2025
Paper 2 · TZA
Specimen 2025
Paper 1A · TZ0
Specimen 2025
Paper 1B · TZ0
Specimen 2025
Paper 2 · TZ0
- Adaptation to environment
Topical questions
QuestionsMark scheme - Carbohydrates and lipids
Topical questions
QuestionsMark scheme - Cell and nuclear division
Topical questions
QuestionsMark scheme - Cell respiration
Topical questions
QuestionsMark scheme - Cell specialization
Topical questions
QuestionsMark scheme - Cell structure
Topical questions
QuestionsMark scheme - Chemical signalling
Topical questions
QuestionsMark scheme - Classification and cladistics
Topical questions
QuestionsMark scheme - Climate change
Topical questions
QuestionsMark scheme - Conservation of biodiversity
Topical questions
QuestionsMark scheme - Defence against disease
Topical questions
QuestionsMark scheme - Diversity of organisms
Topical questions
QuestionsMark scheme - DNA replication
Topical questions
QuestionsMark scheme - Ecological niches
Topical questions
QuestionsMark scheme - Enzymes and metabolism
Topical questions
QuestionsMark scheme - Evolution and speciation
Topical questions
QuestionsMark scheme - Gas exchange
Topical questions
QuestionsMark scheme - Gene expression
Topical questions
QuestionsMark scheme - Homeostasis
Topical questions
QuestionsMark scheme - Inheritance
Topical questions
QuestionsMark scheme - Membranes and membrane transport
Topical questions
QuestionsMark scheme - Muscle and motility
Topical questions
QuestionsMark scheme - Mutation and gene editing
Topical questions
QuestionsMark scheme - Natural selection
Topical questions
QuestionsMark scheme - Neural signalling
Topical questions
QuestionsMark scheme - Nucleic acids
Topical questions
QuestionsMark scheme - Organelles and compartmentalization
Topical questions
QuestionsMark scheme - Origins of cells
Topical questions
QuestionsMark scheme - Photosynthesis
Topical questions
QuestionsMark scheme - Populations and communities
Topical questions
QuestionsMark scheme - Protein synthesis
Topical questions
QuestionsMark scheme - Proteins
Topical questions
QuestionsMark scheme - Reproduction
Topical questions
QuestionsMark scheme - Stability and change
Topical questions
QuestionsMark scheme - Transfers of energy and matter
Topical questions
QuestionsMark scheme - Transport
Topical questions
QuestionsMark scheme - Viruses
Topical questions
QuestionsMark scheme - Water
Topical questions
QuestionsMark scheme - Water potential
Topical questions
QuestionsMark scheme
IB Diploma Biology HL — Topical workbook
Course library
IB Diploma Biology HL — Workbook answers
Course library