(i) Apomixis :
The phenomenon of formation of embryo(s) by asexual methods without formation of gametes and fertilization is termed as apomixis.
(ii) There are three main categories of apomixis.
1. Recurrent
2. Non-recurrent and
3. Adventive embryony.
1. Recurrent apomixis : In this diploid sporophytic cell, archesporial cell or nucellus form embryos, When diploid megaspore mother cell forms embryo sac it is known as diplospory. It is also called apospory.
2. Non-recurrent apomixis : Haploid embryo sac is formed but the embryos arise either from egg cell or any other haploid cell. It is also known as apogamy.
3. Adventive Embryony : In this in addition to normal zygotic embryo, additional embryos develop from nucellus or integuments. It results in polyembryony
