The main purpose of photosynthesis in plants is to convert light energy into chemical energy stored in glucose. This process takes place in the chloroplasts of plant cells, where chlorophyll captures sunlight. Using carbon dioxide from the atmosphere and water from the soil, plants produce glucose and release oxygen as a byproduct. The glucose serves as an essential energy source for the plant, supporting growth, reproduction, and maintenance. Overall, photosynthesis is critical not only for plant life but also for the balance of oxygen and carbon dioxide in the atmosphere, supporting life on Earth.