The C4.2 Transfer of energy and matter section is part of the International Baccalaureate (IB) Biology SL and HL course and covers key learning outcomes required for both SL and HL students. This topic introduces C4.2.1 Ecosystems, C4.2.2 Sunlight, C4.2.3 Flow of chemical energy through food chains, C4.2.4 Construction of food chains and food webs, and C4.2.5 Supply of energy to decomposers, providing the foundation for success in Papers Paper 1, Paper 2, and Paper 3.

On this page, you'll find everything you need to master C4.2 Transfer of energy and matter. The International Baccalaureate (IB)-style Question Bank provides exam-style practice questions with detailed, step-by-step solutions. Our Interactive Flashcards are designed for fast revision of formulas, definitions, and International Baccalaureate (IB)-specific terminology. For deeper understanding, Step-by-Step Lessons guide you through worked examples aligned with the International Baccalaureate (IB) syllabus. If you prefer to learn visually, our Engaging Video Tutorials break down complex concepts in a clear and accessible way. Finally, the Concise Notes offer syllabus-aligned summaries, perfect for last-minute study sessions or quick review before exams.