Ovules are borne on

$A$- Four cells are at the chalzal end and are called the antipodals.

$R -$ A typical angiosperm embryo sac, at maturity,though $8$-nucleate is $7$-celled

Synergid's filiform apparatus

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