B4.2.3—Photosynthesis as nutrition mode
Photosynthetic nutrition uses light energy to make organic molecules from carbon dioxide and historically released oxygen into the atmosphere over time.
- Syllabus
- First assessment 2025
- Objective
- B4.2.3
- Level
- HL
Concept essentials
- Photoautotrophs use light energy to produce organic compounds from carbon dioxide.
- Cyanobacteria were early oxygen-producing photosynthetic organisms.
- Oxygen released by photosynthesis accumulated in the atmosphere over time.
- Photosynthetic organisms act as producers in ecosystems.
ConceptIB Biology HL