What is photosynthesis according to ordinary level GCE standards

Photosynthesis is the process used by plants, algae, and cyanobacteria to convert light energy into chemical energy. This chemical energy is stored in carbohydrate molecules, such as sugars, which are synthesized from carbon dioxide and water. Oxygen is released as a byproduct.

The overall chemical equation for photosynthesis is:

6CO₂ + 6H₂O + Light Energy → C₆H₁₂O₆ + 6O₂

This process is vital for life on Earth as it produces most of the oxygen in the atmosphere and provides the primary source of energy for most ecosystems.