A leaf is placed in a sealed transparent chamber. A student records a fall in carbon dioxide concentration during illumination and concludes that this equals the total carbon dioxide used in photosynthesis.
Which statement identifies the error in this conclusion?
Respiration releases carbon dioxide, so total photosynthetic uptake is smaller.
Respiration absorbs carbon dioxide, so total photosynthetic uptake is smaller.
Respiration absorbs carbon dioxide, so total photosynthetic uptake is greater.
Respiration releases carbon dioxide, so total photosynthetic uptake is greater.
44 exam-style questions on Edexcel GCSE Biology 6.1 Photosynthesis, covering 6.1.1 Photosynthetic organisms as producers, 6.1.2a Limiting factors on the rate of photosynthesis, 6.1.2b Interactions of limiting factors on photosynthesis, and 6.1.3 Inverse square law and light intensity. Each one has a worked solution and a mark scheme showing where the marks go.