The carbon and energy requirements of autotrophic organisms are fulfilled through photosynthesis. During this process, autotrophs, such as plants, take in carbon dioxide and water from the environment. In the presence of sunlight and chlorophyll, these substances are converted into carbohydrates, serving as stored forms of energy. Carbohydrates, the primary product of photosynthesis, are then utilized by the autotrophic organisms for providing energy to support their metabolic activities. This crucial biological process not only sustains the energy needs of autotrophs but also contributes to the production of oxygen as a byproduct, benefiting the ecosystem.