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IB Biology HL C1.3.3 Oxygen As By Product Questions

Explain how light splits water, releasing oxygen rather than CO₂; identify plants, algae and cyanobacteria as oxygenic photosynthesizers in IB Biology HL C1.3.3.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain that light-driven photolysis of water releases oxygen during photosynthesis; the oxygen does not come directly from carbon dioxide.
  • Identify plants, algae and cyanobacteria as organisms that carry out oxygenic photosynthesis.

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