A student grows algae in an illuminated container containing water and mineral ions. No organic food is added. The dry mass of algae increases.
Which statement best explains this increase?
Carbon dioxide supplies carbon for new organic molecules.
Light supplies carbon for new organic molecules.
Mineral ions supply carbon for new organic molecules.
Oxygen supplies carbon for new organic molecules.
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.