The diagram is an illustration of a part of a flower. Study it and answer the question below; The function of the part labeled I is

The function of the part labeled I is to receive the pollen grain. Part I, which is called the stigma, is the top part of the female reproductive structure of a flower called the pistil. The stigma is covered with a sticky substance that allows it to capture pollen grains that are transferred from the male reproductive structure, the anther, either by wind, insects or other means. Once the pollen grain has landed on the stigma, it can then germinate and produce a pollen tube that grows down through the style, which is the narrow part of the pistil connecting the stigma to the ovary. This allows the male gametes in the pollen to reach the ovules in the ovary, leading to double fertilization and the production of seeds. Therefore, the main function of the stigma is to receive the pollen grain and provide the site for germination and subsequent fertilization. It does not directly attract pollinators, although some flowers may have other structures, such as bright colors or strong scents, to help attract pollinators to the flower.