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A1.1 Water

A1.2 Nucleic acids

A2.1 Origins of cells (HL)

A2.2 Cell structure

A2.3 Viruses (HL)

A3.1 Diversity of organisms

A3.2 Classification and cladistics (HL)

A4.1 Evolution and speciation

A4.2 Conservation of biodiversity

B1.1 Carbohydrates and lipids

B1.2 Proteins

B2.1 Membranes and membrane transport

B2.2 Organelles and compartmentalization

B2.3 Cell specialization

B3.1 Gas exchange

B3.2 Transport

B3.3 Muscle and motility (HL)

B4.1 Adaptation to environment

B4.2 Ecological niches

C1.1 Enzymes and metabolism

C1.2 Cell respiration

C1.3 Photosynthesis

C2.1 Chemical signalling (HL)

C2.2 Neural signalling

C3.1 Integration of body systems

C3.2 Defense against disease

C4.1 Populations and communities

C4.2 Transfer of energy and matter

D1.1 DNA replication

D1.2 Protein synthesis

D1.3 Mutations and gene editing

D2.1 Cell and nuclear division

D2.2 Gene expression (HL)

D2.3 Water potential

D3.1 Reproduction

D3.2 Inheritance

D3.3 Homeostasis

D4.1 Natural selection

D4.2 Sustainability and change

D4.3 Climate change

IB Biology Topic B4.2: Ecological Niches Lessons

Written by IB Experts

This lesson delivers structured, step-by-step lessons that guide students through every part of the IB Biology syllabus for B4.2 Ecological niches. These lessons simplify complex ideas like molecular biology, evolutionary mechanisms, and homeostasis, while worked examples show how to approach IB-style questions.

Designed for both HL and SL learners, RevisionDojo lessons ensure students not only understand the theory but also know how to apply it in IB Paper exam situations.

With clear explanations, active learning checks, and a syllabus-first design, RevisionDojo makes revision less overwhelming and more effective.

B4.2.1 Ecological niche as the role of a species in an ecosystem

B4.2.2 Organisms that are obligate anaerobes, facultative anaerobes and obligate aerobes

B4.2.3 Photosynthesis as the mode of nutrition

B4.2.4 Holozoic nutrition in animals

B4.2.5 Mixotrophic nutrition in some protists

B4.2.6 Saprotrophic nutrition in some fungi and bacteria

B4.2.7 Diversity of nutrition in archaea

B4.2.8 Dentition and the diet of omnivorous and herbivorous members of the family Hominidae

B4.2.9 Adaptations of herbivores for feeding on plants and of plants for resisting herbivory

B4.2.10 Adaptations of predators

B4.2.11 Adaptations of plant form for harvesting light

B4.2.12 Fundamental and realized niches

B4.2.13 Competitive exclusion and the uniqueness of ecological niches

IB Biology Topic B4.2: Ecological Niches Lessons

A - Unity and Diversity

B - Form and Function

C - Interaction and Interdependence

D - Continuity and Change

IB Biology Topic B4.2: Ecological Niches Lessons

A - Unity and Diversity

B - Form and Function

C - Interaction and Interdependence

D - Continuity and Change

Lessons for B4.2 Ecological niches - IB

IB Biology Topic B4.2: Ecological Niches Lessons