Fertilization in flowering plants begins with pollination, where pollen grains from the male anther are transferred to the female stigma. The pollen grain germinates, forming a pollen tube that grows down the style toward the ovary, where ovules are located. The tube penetrates the ovule, allowing the sperm cells to travel down and fertilize the egg cell, resulting in a zygote. Simultaneously, one sperm fuses with two polar nuclei to form triploid endosperm, which nourishes the developing embryo, completing the fertilization process.
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