The ovule represents which stage?

Describe the pistil (gynoecium).

The haploid cell which divides by mitosis to form the embryo sac is:

In an embryo sac of a typical angiosperm,there are:

How many embryo sacs are present in $100$ mature female gametophytes?

In angiosperms,the following events occur during megasporogenesis and megagametogenesis:
$(i)$ Differentiation of megaspore mother cells
$(ii)$ Meiosis of the megaspore mother cell
$(iii)$ Formation of a linear tetrad
$(iv)$ Mitotic division of the functional megaspore
$(v)$ Degeneration of $3$ megaspores
$(vi)$ Formation of embryo sac
$(vii)$ Fusion of polar nuclei
The correct sequence is: