The reserve food in angiosperm seeds is stored either in the cotyledons or in the:

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The endosperm is a nutrient-rich tissue that forms as a result of double fertilization in angiosperms. It acts as a food reserve for the developing embryo in the seed. In some species, the cotyledons also store reserve food, but in others, they may have other functions such as photosynthesis. The gametophyte, megaspore, and ovary wall are not involved in storing reserve food in angiosperm seeds. The sporophyte is the entire plant body, so it cannot be a specific location for seed storage.

The Reserve Food in Angiosperm Seeds Is Stored Either in the Cotyledons