Pollen tube at the time of entering embryo sac has

An embryo sac has:

At the time of entering embryo sac the pollen tube contains

At the time of entering embryo sac the pollen tube contains

At the time of entering embryo sac the pollen tube contains

At the time of entering embryo sac the pollen tube contains

Rerely in angiosperms, the pollen tube developed further in embryo sac. The abnormality is called

In angiosperm pollen tube is a ferilizing agent. How does the pollen tube gain its entry into the embryo sac of the ovule?

The pollen tube usually enters the embryo sac:

Pollen tube usually enters the embryo sac :