Final answer:
In double fertilization, one sperm cell fuses with the egg while the other fuses with the polar nuclei, forming a zygote and endosperm, respectively.
Explanation:
Pollen tube is formed during the double fertilization process to help the sperm reach the egg in the ovary. In this process, one sperm cell fertilizes the egg, forming a diploid zygote, while the other sperm cell fuses with the polar nuclei to form a triploid endosperm. This double fertilization is essential in angiosperms for seed development.
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