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Megaspore
A type of spore in some plants that develops into a female gametophyte, distinguished by being larger than other types of spores, such as microspores.
Female Gametophyte
The gamete-producing structure in plants and algae that develops into the female gamete.
Embryo Sac
Female gametophyte (megagametophyte) of flowering plants.
Polar Nuclei
Two nuclei in the embryo sac of flowering plants that fuse with a sperm cell to form the endosperm, nourishing the developing embryo.
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