Answer:
Coleoptile
Step-by-step explanation:
In a monocot seed, the embryo inside the seed grows into an embryonic shoot called plumule and the embryonic root called the radicle.
In monocots, the plumule of the monocot is enclosed by a sheath formed by the extension of cells called coleoptile. The coleoptile is present at the time of germination which protects the apical meristem of the young shoot from the frictional force faced by the growing seedling to the soil particles.
The coleoptile is not composed of the apical meristem cells therefore it dies off later.