The process that allows plants to take in carbon dioxide from the atmosphere is known as photosynthesis. During photosynthesis, plants convert carbon dioxide and water into glucose and oxygen, using sunlight as the energy source. This vital process occurs mainly in the chloroplasts of plant cells, where chlorophyll captures light energy. Photosynthesis is crucial for the survival of plant life and is fundamental to the Earth’s ecosystem, providing oxygen and serving as the primary source of energy for most living organisms.