A sunflower plant is growing in bright light with a good supply of water and carbon dioxide.
Which statement describes what happens to the oxygen formed during the first stage of photosynthesis in its leaves?
It is a by-product and can diffuse out of the leaf.
It is held for the second stage and joined with carbon dioxide.
It is converted into starch and stored in the leaf.
It is carried down to the roots in the xylem.
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.