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
- SL
Exam analysis
Chance of appearing1%of analysed past papers
Latest appearanceNovember 2015
Most common paperPaper3
Typical marks3
Recent exam appearances
November 2015Paper3 ["SL"] · TZ012(a)[ 3 ]B4.2.3—Photosynthesis as nutrition mode
Practice this objective
Coverage 2015–2015 · Updated 15 Jul 2026
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.