What is an ovule called when it is arranged transversely?

Select the correct option for megasporogenesis.

The megaspore mother cell is differentiated from one of the cells of the

The arrangement of megaspores in a tetrad in a gymnosperm is:

The ovule is morphologically equivalent to:

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: