Cotyledons are the first leaves of a seedling as it emerges from the seed so therefore germination of the seed originates the cotyledons.
Cotyledons are energy and food to the plan when it is in the beginning stages of germination.
-verb (used without object) 1. to take its origin or rise; begin; start; arise: The practice originated during the Middle Ages. 2. (of a train, bus, or other public conveyance) to begin a scheduled...
corn
Yes, they can be of the same magnitude and direction.