The origin of embryo from either synergids or antipodal cells of the embryosac is called
Apomixis refers to the development of seed without sexual fusion (fertilization). In apomixis embryo develops without fertilization. There are four types of apomixis:
1. Parthenogenesis - refers to development of embryo from the egg cell without fertilization.
2. Apogamy - The origin of embryo from either synergids or antipodal cells of the embryosac is called as apogamy.
Apospory - In apospory, first diploid cell of ovule lying outside the embryosac develops into another embryosac without reduction. The embryo then develops directly from the diploid egg cell without fertilization.4. Adventive embryony - The development of embryo directly from the diploid cells of ovule lying outside the embryosac belonging to either nucellus or integuments is referred to as adventive embryony.