The process in which seeds are formed but embryo develops without fertilization is

The process in which seeds are formed but an embryo develops without fertilization is Apomixis.
Apomixis (asexual seed formation) is the result of a plant gaining the ability to bypass the most fundamental aspects of sexual reproduction: meiosis and fertilization. Without the need for male fertilization, the resulting seed germinates a plant that develops as a maternal clone.