A scientist grew a willow tree in a pot of soil for five years. The tree was given only water. The mass of the tree increased by 74 kg. The mass of the soil decreased by only 0.06 kg. Which statement best explains where most of the extra mass of the tree came from?
minerals taken up from the soil by the roots of the tree
oxygen taken in from the air by the leaves of the tree
glucose absorbed from the soil by the roots of the tree
carbon dioxide and water used in photosynthesis to make glucose
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.