Discussion
When somatic cells of ovule directly form embryos, the phenomenon is called as ......................
Answer: A
Embryos formed directly from somatic cells of the ovule are called adventive embryony.
In adventive embryony, a form of sporophytic apomixis, embryos arise directly from diploid cells of the nucellus or integument, without forming an embryo sac or gametophyte. It is common in Citrus and mango, where a seed may contain several nucellar embryos alongside the zygotic one (polyembryony).
Diplospory and apospory are gametophytic apomixis: an unreduced embryo sac forms, from the megaspore mother cell in diplospory or from a somatic nucellar cell in apospory, and its egg develops without fertilisation. Parthenogenesis is that development of an unfertilised egg, not the direct formation of embryos from somatic cells.
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