Inside the uterus, the nucleus of the zygote divides into two nuclei. The nucleus is located at the two poles of the cell. Nuclei of both poles divide twice in succession to form eight nuclei of four each. One nucleus from each pole moves to the center of the cell and fuses to form the secondary nucleus. Among the three upper nuclei, the large nucleus in the middle is the ovum.
Fertilization of sperm and egg occurs in the follicle. After fertilization, the ovary of the flower is stimulated. The uterus grows and changes in its various parts. As a result, the uterus grows. The wall of the uterus forms the placenta. If the ovary of each flower of an inflorescence develops into a fruit, it is called simple fruit or single fruit. Mango, jam, litchi, plum etc. are single fruits. When a single fruit is produced from a complete inflorescence, it is called a compound fruit. Composite fruits like jackfruit, pineapple etc.