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It is a physico-chemical process by which green plants fix the atmospheric carbon dioxide in the presence of sunlight and water and there by, synthesize the required food material (later, stored in the form of starch). Oxygen and water are the by products obtained in this process.
 6CO₂ + 12H₂O ------(in the presence of light)----->>  C₆H₁₂O₆ + 6H₂O + 6O₂
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Photosynthesis can be defined as the process in which carbohydrates are combined with water to form a complex inorganic molecule in the presence of sunlight in chroloplast of a green plant is called photosynthesis in which food is prepared and oxygen and water are released to air.
 6CO₂ + 12H₂O ⇒ C₆H₁₂O₆ + 6CO₂ +6H₂O

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6CO₂ + 12H₂O ------(in the presence of light)----->> C₆H₁₂O₆ + 6H₂O + 6O₂
it is a chemical process