Monoembryony is the emergence of one and only one seedling from a

seed A seed is an embryonic plant enclosed in a protective outer covering, along with a food reserve. The formation of the seed is a part of the process of reproduction in seed plants, the spermatophytes, including the gymnosperm and angiosper ...

. A seed giving two or more seedlings is

polyembryonic Polyembryony is the phenomenon of two or more embryos developing from a single fertilized egg. Due to the embryos resulting from the same egg, the embryos are identical to one another, but are genetically diverse from the parents. The genetic differ ...

. Some of the nuclear cells surrounding the

embryo sac In seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: the ''integument'', forming its outer layer, the ''nucellus'' (or remnant of the megasporangium), and the fem ...

start dividing and protrude into the embryo sac and develop into embryos. American Journal of Botany 98(10): 1613–1622. 2011. https://bsapubs.onlinelibrary.wiley.com/doi/epdf/10.3732/ajb.1100022

References

Plant reproduction Embryology {{developmental-biology-stub