This is a picture of popcorn. Popcorn contains endosperm. Endosperm is found in angiosperms, any plant that develops flowers and fruits. Endosperm functions to provide nutritive tissue to the developing embryo, or baby plant, of a seed. Popcorn, or a corn kernel/seed, has a core of soft, wet endosperm that is surrounded by a layer of hard endosperm. When heated, the water in the soft endosperm turns into steam, which expands until the pressure gets high enough for the kernel to explode, turning itself inside out. The hard endosperm then expands in volume, turning the hard kernel into popcorn.
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