Megaspores are produced from the megaspore mother cells after

The body of the ovule is fused within the funicle at

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

$A$ - Due to meiosis is $MMC$, microspore tetrads produce

$R$ - $MMC$ is a large cell containing dense cytoplasm and a prominent nucleus