Labelled diagram of Germination of pollen on stigma
Labelled diagram of Germination of pollen on stigma: Fertilization occurs in the plant after pollination. The diagram shows the female reproductive tract as well as the male reproductive tract. The female reproductive part consists of three parts, the swollen lower part is the ovary, the middle elongated part is the style and the last part which is sticky is the stigma.
Ovaries contain ovules and each ovule contains an egg cell. The male germ cell produced from the pollen grain fuses with the female gamete in the ovule. This fusion or fertilization of the germ cells gives us the zygote which is capable of growing into a new plant.
Pollen must be transferred from the stamen to the stigma. When the transfer of pollen grains takes place within a single plant, it is called self pollination. And if the pollen grains are transferred from one flower to another, it is called cross pollination.
After the pollen has landed on the appropriate stigma, it must reach the female germ-cells in the ovary. For this, a tube grows from the pollen grain and travels through the style to reach the ovary.
After fertilization, the zygote divides several times to form an embryo in the ovum. The ovule develops a tough coat and gradually transform into a seed.
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