<Tr> <Th_colspan="2"> Trinomial name </Th> </Tr> <Tr> <Td_colspan="2"> Zea mays everta </Td> </Tr> <P> Popcorn, or pop corn, is a variety of corn kernel, which forcefully expands and puffs up when heated . </P> <P> A popcorn kernel's strong hull contains the seed's hard, starchy endosperm with 14 - 20% moisture, which turns to steam as the kernel is heated . The pressure continues building until it exceeds the hull's ability to contain it . The kernel ruptures and forcefully expands, allowing the contents to expand, cool, and finally set in a popcorn puff 20 to 50 times the size of the original kernel . </P>

What part of the corn does popcorn come from