Photosynthesis occurs in plant cells, algae and some bacteria that contain special pigments, like chlorophyll. In the stage of light (or photochemical phase), the energy from sunlight is captured by chlorophyll and other pigments, and this energy is used to convert carbon dioxide (CO2) and water (H2O) in glucose (C6H12O6) and oxygen (O2). During the dark stage (or chemical phase), also called the Calvin cycle, glucose is synthesized from carbon dioxide using the chemical energy produced in the light stage. The oxygen released during photosynthesis is essential for the respiration of many living beings., including us, humans. While plants produce oxygen, They also provide food in the form of glucose for their own growth and for other organisms that feed on them..

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