Megasporangium is equivalent to

In the $Polygonum$ type of embryo sac,all cells are .....

The part of the pistil that receives pollen is:

What is an ovule called when it is arranged transversely?

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:

$A$ mature embryo sac at the final stage of development contains: (in $cells$)