In $Capsella$,from where does the embryo sac derive its nutrition?

How many meiotic and mitotic divisions are required for the formation of a fully mature female gametophyte (embryo sac) from a megaspore mother cell?

Identify the labelled parts $X, Y$ and $Z$ from the given figure of an embryo sac:

The filiform apparatus is found in ........

Choose the correct sentences:
$(i)$ The gynoecium represents the female reproductive part of the flower.
$(ii)$ Ovule is located in the anther.
$(iii)$ Each pistil has three parts: the stigma,style,and ovary.
$(iv)$ The uppermost part of the gynoecium is the anther.

Which cells are located at the chalazal end in the embryo sac?