IB Biology SL 8.3.3 Oxygen from photolysis Question Bank
Practise IB Biology SL 8.3.3 by explaining how light splits water and releases oxygen during photosynthesis.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain that photolysis splits water using light energy and releases oxygen as a photosynthetic by-product.
- Relate oxygen-release observations in aquatic plants to water splitting during photosynthesis.
C1.3.3—Oxygen as by-product question 1
A photosynthesis experiment was carried out using an aquatic plant. The image shows the contents of the test tube after being exposed to light and room temperature for 30 minutes.
What explains the presence of bubbles?
A
Oxygen is formed when carbon dioxide combines with chlorophyll.
B
Carbon dioxide is formed during the light-dependent reaction.
C
Oxygen is released when light splits water molecules in chloroplasts.
D
Carbon dioxide is released from dissociation of sodium hydrogen carbonate.
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