Q.What is polyembryony? Name the plant in which it was first reported and explain how it commonly arises.

Polyembryony is the condition in which a single seed contains more than one embryo, rather than the usual single zygotic embryo. It was first reported by Leeuwenhoek in the genus Citrus, which remains one of its best-known examples along with mango.

Polyembryony commonly arises when, in addition to the normal zygotic embryo (formed by syngamy), some of the diploid cells of the surrounding nucellus begin dividing on their own and also develop into embryos -- a phenomenon called nucellar embryony, which is itself a form of apomixis, since these extra embryos form without any fertilisation. Polyembryony can also arise when more than one embryo sac develops within a single ovule, so that more than one egg gets fertili …

State the definition (more than one embryo, one seed), name the genus of first report, then explain …

Assuming every extra embryo in polyembryony must come from a second fertilisation -- most commonly the extra embryos are nucellar …