Pollen as large as about 90–100 µm. In angiosperms, during flower development the anther is composed of a mass of cells that appear undifferentiated, except for a partially differentiated dermis. As the flower develops, four groups of sporogenous cells form within the anther. The fertile sporogenous cells are surrounded by layers of sterile cells that grow into the wall of the pollen sac. Some of the cells grow into nutritive cells that supply nutrition for the microspores that form by meiotic division from the sporogenous cells. In a process called microsporogenesis, four haploid microspores are produced from each diploid sporogenous cell
The Flower Girl then, other works have also been adapted into movies "under his guidance", including "The Flower Girl". The opera was intended to promote the communist ideology, by incorporating themes such as the class struggle against the bourgeois; such themes were similarly maintained in the film. In April 1972, the film adaptation was officially launched. The film was directed by Choe Ik-kyu and the script was written by Pak Hak; "Paekdu-san Group" was responsible for the production of the film. According to Paul Fischer, the author of "A Kim Jong-Il Production", "it is almost impossible to exaggerate" the importance of "The Flower