Endosperm

The endosperm is found in angiosperms and nourishes the growing embryo inside the seed. It is formed when one of the two sperm cells fuse with the two polar cells, creating the triploid endosperm. The majority of angiosperms contain the endosperm, except for the orchid, for example. In some plants, the endosperm is consumed before germination, while in others, it occurs after. The angiosperm embryos that do not have an endosperm usually obtain their nutrients before they become dormant. In the picture below, an endosperm could be found in the seed that was used to nourish the embryo. 

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