Photosynthesis happens in all photoautotrophic organisms.
- A photoautotrophic organism is one that uses light to synthesise - or make - organic molecules.
- Green plants that convert carbon dioxide into carbohydrates in the presence of sunlight are called photoautotrophs, and are primary producers.
Biological molecules produced by photosynthesis are consumed by other organisms.
- We call this the nutrient cycle (this is another topic covered in Geography).