| I: | Only green plants can prepare their own food. | 
| II: | In green plants, all cells, tissues and organs photosynthesise. | 
| 1. | Only I | 
| 2. | Only II | 
| 3. | Both I and II | 
| 4. | Neither I nor II | 
| I: | carbon dioxide is reduced. | 
| II: | oxygen is released. | 
| III: | the hydrogen carrier is NAD. |