Pollen tubes allow sperm to fertilize the egg.
A pollen tube is generated from the pollen that extends down its style into the ovule during pollination process of higher plants. Pollen nuclei move down the pollen tube and fertilize the ovule after the pollen germinates upon that stigmatic surface.
Sperm- An ovum (egg cell), which would be produced by the a biologically female body, is the target of a sperm cell, which is intended to be discharged during sexual activity. Once they are joined, the sperm will enter the egg and fertilize it to produce new genetic material. A pollen grain is a microscopic male gametophyte or male plant (gamete-forming plant).
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