1. Here the hypocotyl is a rudimentary axis between radicle and plumule . 2. Growth of the plumule does not occur until the cotyledons have grown above ground. 3. A . Seed Coat B . Cotyledon C . Hilum D . Plumule E . Radicle F . Endosperm 4. These seeds develop by the plumule growing up through the soil with the cotyledons remaining below the surface. 5. Fledglings are born with cryptic plumules that help them blend in with the surrounding ground material to avoid predation. 6. In most seeds, for example the sunflower, the plumule is a small conical structure without any leaf structure. 7. However, in seeds such as the broad bean, a leaf structure is visible on the plumule in the seed. 8. The plumule is the part of a seed embryo that develops into the shoot bearing the first true leaves of a plant. 9. It involves the reactivation of the metabolic pathways that lead to growth and the emergence of the radicle or seed root and plumule or shoot. 10. The coleoptile is a protective cap that covers the " plumule " ( precursor to the stem and leaves of the plant ).
