Almost all food chains start with a plant or an alga. Which statement explains why?
Plants and algae are the largest organisms in most food chains.
Plants and algae use light to make glucose, which is used to make biomass.
Plants and algae take in biomass from the soil through their roots.
Plants and algae release oxygen, which animals use to make biomass.
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.