At what stage embryo sac is ready for fertilisation?

The embryo sacs are

A typical embryo sac is

A trpical embryo sac is

In Capsella, embryo sac is

Describe longitudinal section of a pistil showing pollen germination. Explain the events in the embryo sac during the process of fertilisation. Which resulting stages give rise to the embryo and the endosperm respectively?

Embryo sac is located in

Which of the following cells of embryo sac degenerate after fertilisation in angiosperms ?

Which of the following cells of embryo sac degenerate after fertilisation in angiosperms ?

Eight nucleated embryo sac is: