A scientist seals several green bean leaves inside a transparent chamber fitted with an oxygen sensor. The chamber is kept in dim light, and the leaves are photosynthesising.
The oxygen concentration in the chamber is 20.9% at the start and is still 20.9% after 40 minutes.
Explain why the oxygen concentration does not change.
117 exam-style questions on OCR GCSE Biology 1.4 Photosynthesis, covering 1.4.1 Photosynthesisers as biomass producers, 1.4.2 Factors affecting the rate of photosynthesis, and 1.4.3 Limiting factors in photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.