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Photosynthesis is the vital process used by plants, algae, and some bacteria to convert light energy into chemical energy. this process, they take in dioxide the air water from the soil. Using sunlight, they transform ingredients glucose, which is food, and oxygen a . This process occurs in cellular structures called chloroplasts, which contain the green pigment chlorophyll. Photosynthesis is fundamental to life on Earth, as it produces most of the planet's oxygen.