Multiple choice An embryo may sometimes develop from an embryo sac, other than egg. This is called apospory partenogenesis parthenocarpy apogamy oogamy Reveal answer Fill a bubble to check yourself D Correct answer Explanation An embryo may sometimes develop from an embryo sac other than egg. This is called apogamy. It is the development of an embryo without fertilization; especially the development in some ferns of a sporophyte from the gametophyte without fertilization.