Sexual reproduction in plants. In all higher plants, flower is a reproductive organ and angiospermic flower typically bears four parts or voles, namely, calyx, carola, androsium and gynosium. Out of these, calyx and carola are protective in function and do not participate in the process. Hence, they are called non-essential voles. Andresium and gynesium produce gametes during reproduction. Therefore, they are called essential voles. When all these four parts are present, the flower is said to be complete and bisexual. Calyx is made up of sepals and carola has petals. Andresium has stamens and a single member of gynosium is called a carpal or pistil. Each stamens has anthors. Poling greens are produced inside anthors by meiosis. Each carpal has ovary at the base, which has one or many ovules. The ovules excel and two polar nuclei are produced by meiosis. Poling greens are transferred from one another to stigma during pollination. Poling greens germinate on stigma to produce poland tube. This poland tube carries two male gametes. Poland tube reaches the embryo sac. One male gamete fuses with the excel to form zygote. The second male gamete fuses with the polar nuclei to form the endosperm. As both nuclei are used and the event of fertilization occurs twice, this is called a double fertilization. After fertilization, zygote develops into embryo, ovules develop into seeds and ovary into fruit. Let's revise this process quickly through a simple flow chart. Flowers have Andresium, Gynosium, Stemens, Carpals, Anthors, Neoses. Poling greens. Volination of ulemiosis. Poland germination on stigma. Polar nuclei. Poland tube. Triple fusion. Fertilization. One male gamete. Second male gamete. Endosperm. Zygote. Zygote. Zygote. Zygote.