Which of the following is not found in the embryo sac of a dicotyledonous plant?

Generally,the embryo sac in angiosperms is . . . . . . .

Choose the correct sentence$(s)$.
$(I)$ Nucleus of the functional megaspore divides meiotically to form two nuclei.
$(II)$ After the $8$-nucleate stage,cell walls are laid down leading to the organization of a typical female gametophyte.
$(III)$ The egg apparatus consists of two synergids and one egg cell.
$(IV)$ Three cells at the chalaza end are called antipodal cells.

The female gametophyte of a typical dicot at the time of fertilization is

In angiosperms,the functional megaspore develops into which of the following?

In angiosperms,the female gametophyte is also known as: