Although cyanobacteria have no chloroplasts, under the electron microscope, there are many photosynthetic membranes in the cytoplasm, called thylakoids, which are attached with various photosynthetic pigments. The process of photosynthesis is carried out here. Normal cyanobacteria are photoautotrophic organisms, and the photosynthetic products that convert inorganic substances into organic substances through light energy and carbon dioxide and store energy are mainly cyanobacteria starch and cyanobacteria particles. So cyanobacteria are autotrophic.