All 11 syllabus topics — free to read. Each page covers key definitions, diagrams explained in words, worked examples and the exact exam traps students lose marks on.
Start: Cell Biology → Revision PackEach topic now has tap-to-reveal flashcards for key definitions and processes — test yourself before diving into the notes.
Work through each section in order. The red trap boxes are the most exam-relevant — never skip them.
After reading a section, write the key definition, process steps, or table from memory before checking back.
Once you can answer questions without notes, tick the topic in the revision checklist.
After finishing a topic, try the Biology questions in the timed mini papers under exam conditions.
O-Level Biology syllabus — 6093
Cell structure, plant vs animal cells, specialised cells, diffusion, osmosis and active transport.
Carbohydrates, proteins and lipids — structure, function, food tests, and digestion.
Lock and key model, effect of temperature and pH, denaturation, enzyme inhibition.
Photosynthesis equation, limiting factors, leaf structure adaptations, mineral ion requirements.
Xylem and phloem, transpiration, factors affecting transpiration rate, translocation.
Heart structure and function, blood vessels, blood components, lymphatic system.
Aerobic and anaerobic respiration, lung structure, ventilation, alveolar gas exchange.
Nervous system, reflex arc, hormones, blood glucose regulation, thermoregulation, kidney.
Neurone structure, synapses, reflex arc, the brain, the eye and the ear — full notes with model answers and 5-question quiz.
Digestive enzymes, the alimentary canal, villus structure, absorption and nutritional deficiency diseases — full notes with 5-question quiz.
Sexual and asexual reproduction, human reproductive system, menstrual cycle, fertilisation, placenta.
DNA, mitosis and meiosis, Punnett squares, sex linkage, natural selection and evolution.
Food chains and webs, energy flow, carbon and nitrogen cycles, human impact, disease and immunity.
GCE O-Level Biology is assessed by the Singapore Examinations and Assessment Board (SEAB) under syllabus code 6093. The examination consists of Paper 1 (multiple choice questions) and Paper 2 (structured questions and free-response answers). Together, the papers assess conceptual understanding, application to unfamiliar contexts, data analysis skills, and the ability to explain scientific phenomena using precise language.
All 11 topics on this page are covered in full — each with clear explanations, worked examples, Must-Know exam points, tap-to-flip flashcards, and 8 O-Level–style quiz questions. The notes are aligned to the SEAB 2026 syllabus.
Beyond the topic notes and flashcards, ScienceStar now has a complete O-Level Biology exam preparation suite covering Paper 1 MCQ, Paper 2 structured questions, practical skills, data-based questions, and more.
O-Level Biology Paper 2–style questions across all 11 topics — cell biology, enzymes, plant nutrition, transport, respiration, homeostasis, reproduction, genetics, ecology, and more. Every question has a full mark scheme showing exactly what examiners credit. Includes cross-topic challenge questions typical of Section C.