IB Biology Question Bank
Practice by topic with exam-style IB Biology questions aligned with the syllabus.
C1.1
Enzymes and metabolism
Catalysis, Active sites, Induced fit, Metabolic pathways, Enzyme inhibition, Feedback control
C1.2
Cell respiration
ATP, anaerobic and aerobic respiration, glycolysis, Krebs cycle, electron transport, chemiosmosis
C1.3
Photosynthesis
Light absorption, Pigments, Limiting factors, Photosystems, Calvin cycle
C2.1
Chemical signalling
Receptors, Ligands, Signal transduction, Second messengers, Feedback
C2.2
Neural signalling
Neurons, resting potential, action potentials, synapses, myelination, pain, consciousness
C3.1
Integration of body systems
System integration, nervous and endocrine signalling, feedback control, tropisms, phytohormones
C3.2
Defence against disease
Pathogens, barriers, phagocytes, antibodies, vaccination, herd immunity, antibiotics, zoonoses
C4.1
Populations and communities
Population estimates, carrying capacity, density dependence, growth models, species interactions, competition tests
C4.2
Transfers of energy and matter
Open systems, food chains, energy loss, production, carbon cycle, nutrient recycling
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