Plumule is a part of the embryo that give rise to the shoot part of plant like the stem, leaves, fruits and seeds while radicle will develop into the roots.
Cotyledons provide nutritional requirements to the developing embryo present in the seed before the plant produces leaves by photosynthesis. Cotyledons of embryo of dicot seeds are photosynthetic behaving like a leaf.
Final Answer:
Plumule give rise to the shoot part while the cotyledons provide the nutrition to the developing embryo.