The gas produced during photosynthesis by plants is oxygen. During this vital process, plants convert carbon dioxide and water into glucose and oxygen, using sunlight as an energy source. Photosynthesis primarily occurs in the chloroplasts of plant cells, where chlorophyll captures light energy. The overall equation for photosynthesis can be simplified as: carbon dioxide + water + sunlight → glucose + oxygen. This process is crucial for life on Earth, as it not only provides oxygen needed by most organisms for respiration but also forms the basis of the food chain by producing energy-rich glucose for plants and, subsequently, for animal consumers.