The pollen grain germinates and produces a pollen tube when a flower is pollinated. The pollen tube enters an ovule after passing through the stigma and into the ovary. After that, fertilization occurs, resulting in the formation of a seed. When a pollen grain comes into contact with the stigma of a flower, the fertilization process in a flowering plant begins. A pollen tube grows through the stigma into the ovary after the pollen grain germinates. When a pollen tube enters an ovule, fertilization occurs. A seed is formed as a result of this process. The process of fertilization is critical for the species' survival. There would be no seeds without fertilization, and there would be no new plants without seeds. Fertilization is also necessary for fruit development. Fruit contains seeds, which will germinate and grow into new plants. Fertilization is a difficult process that does not always work. The pollen grain may not germinate or the pollen tube may not reach the ovule in some cases. The pollen grain may not be able to fertilize the ovule in other cases. Despite these difficulties, fertilization is an essential process for the species' survival.