In angiosperms embryosac is developed from
Megaspore mother cell
Secondary nucleus
Endothecium
Microspore mother cell
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
The germination of pollen grain results in the formation of
Location and Function :
$1.$ Nucellus
$2.$ Filiform structures
Female gametophyte of a typical dicot at the time of fertilization is
The sequence of development of embryo sac is