Autotrophic organisms can only use light energy when synthesizing organic matter, which is correct. Autotrophic organisms use light energy to convert inorganic substances into organic substances. As an ecological term, autotrophs are also called independent vegetative organisms. Its corresponding word is heterotrophs. Organisms that survive and reproduce by inorganic nutrition are the corresponding words of organic nutritious organisms. Organisms that assimilate carbon by using the energy obtained from dark chemical reactions such as respiration or photochemical reactions are called chemoautotrophs and photoautotrophs, respectively. They use inorganic substances as nutrients and can make organic substances for their own growth.