This ready-to-teach IBDP Biology C1.3 Photosynthesis lesson pack provides a complete teaching sequence covering the transformation of light energy into chemical energy and the interdependence of the light-dependent and light-independent reactions. The resource is fully aligned to the IB Biology 2025 syllabus and includes structured slides, guided student notes, data-analysis activities, and a simulation-based investigation suitable for developing Internal Assessment-style skills.

Created by an experienced IB Biology teacher, this lesson sequence is designed to reduce preparation time while supporting strong conceptual understanding and exam-relevant explanations.

Included in this resource

✔ Editable PowerPoint lesson covering C1.3.1–C1.3.19
✔ Structured student notes and guided question workbook
✔ Absorption vs action spectrum spreadsheet activity
✔ Photosynthesis investigation simulation (Elodea canadensis) method sheet
✔ Data-processing guidance (mean, SD, trend lines, R² interpretation)
✔ Exam-style review questions with conceptual linking prompts
✔ Coverage of both SL and HL extension content

Topics covered

Students learn:

• transformation of light energy into chemical energy
• photolysis of water and oxygen production
• roles of photosystem I and photosystem II
• generation of ATP by chemiosmosis
• reduction of NADP
• structure and function of photosystems
• pigment chromatography techniques
• absorption vs action spectra comparisons
• limiting factors affecting photosynthesis
• experimental investigation of environmental variables
• Free Air CO₂ Enrichment (FACE) experiments
• Calvin cycle reactions and RuBP regeneration
• synthesis of triose phosphate and downstream carbon compounds
• interdependence of light-dependent and light-independent reactions

Includes a simulation-based investigation suitable for IA skill development
Students investigate limiting factors affecting photosynthesis using a structured Elodea simulation exploring:

• light intensity
• wavelength
• temperature
• pH
• NaHCO₃ concentration