A fertilized ovule undergoes the following changes in the ovary in an angiosperm plant :
Unfertilized ovule → Fertilized ovule → Seed
Funiculus → Present
Hilum → Present
Integument → Seed coat
Outer integument → Testa
Inner integument → Tegmen
Chalaza → Present
Micropyle → Present
Nucellus → Absent or present as perisperm
Embryo Sac :
Antipodal cells → Degenerate
Synergid cell → Degenerate
Secondary nucleus → Endosperm
Egg → Embryo
When the unfertilized ovule undergoes double fertilization, it makes fertilized ovule and then seeds. In this process funiculus and hilum are present. Outer integument makes testa and inner integument is tegmen. Chalaza and micropyle are present but nucellus is absent, partly persists as perisperm. In embryo sac antipodals and synergids degenerate. The central cell makes endosperm, cl'ranges into embryo.
