A researcher studies photosynthesis in a sample of photosynthetic bacteria. The table shows the energy transferred when enough carbon dioxide and water react to make a fixed amount of glucose.
| Energy transfer | Energy in kJ |
|---|---|
| Energy needed to break bonds in carbon dioxide and water | 15 300 |
| Energy released when bonds form in glucose and oxygen | 12 500 |
Calculate the extra energy that must be supplied for this reaction.
Explain why the calculation shows that photosynthesis is endothermic, where the absorbed energy is stored and what happens to glucose production if the bacteria are then kept in complete darkness.
68 exam-style questions on AQA GCSE Biology 4.1 Photosynthesis, covering 4.1.1 Photosynthetic reaction, 4.1.2 Rate of photosynthesis, and 4.1.3 Uses of glucose from photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.