In the seed, the embryo is divided into the parts that will soon develop from it The first leaves are the cotyledon, and what will become the first and/or primary root is the radicle
A rootlet or structure resembling one, a minute veinlet joining with others to form a vein
The rudimentary stem of a plant which supports the cotyledons in the seed, and from which the root is developed downward; the stem of the embryo; the caulicle