Photosynthesis is the process by which plants make carbohydrates from raw materials, using energy from light. During photosynthesis:
- light energy is absorbed by chlorophyll - a green substance found in chloroplasts in green plant cells and algae
- absorbed light energy is used to convert carbon dioxide (from the air) and water (from the soil) into a sugar called glucose
- oxygen is released as a by-product
Some glucose is used for respiration, while some is converted into insoluble starch for storage. The stored starch can later be turned back into glucose and used in respiration.