Explain the process by which the energy requirements of autotrophic organisms are fulfilled. In which form are the unused carbohydrates stored?

(N/A) Autotrophic organisms fulfill their energy requirements through a process called $Photosynthesis$.
In this process, autotrophs take in external substances like $CO_2$ and $H_2O$ and convert them into energy-rich carbohydrates in the presence of sunlight and chlorophyll.
The chemical reaction is: $6CO_2 + 12H_2O \xrightarrow[Chlorophyll]{Sunlight} C_6H_{12}O_6 + 6O_2 + 6H_2O$.
The carbohydrates that are not immediately used by the plant are stored in the form of $Starch$.