In seed plants, the union of sperm and egg does not require:

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Seed plants have evolved a method of reproduction that does not require the release of swimming sperm into the environment. Instead, male gametes are delivered directly to the egg via a pollen tube, which grows from the germinated male spore through the tissues of the ovule-bearing sporophyte. This eliminates the need for aerial dispersal of male gametes and the growth of the male gametophyte through the tissues of the ovule.

In Seed Plants, the Union of Sperm and Egg Does