The nutritive tissue present in the ovule is called

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:

How many meiotic divisions are required for the formation of $100$ functional megaspores?

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Synergids	$(1)$ Female gamete
$(b)$ Central cell	$(2)$ Chalazal end
$(c)$ Antipodals	$(3)$ Filiform apparatus
$(d)$ Egg cell	$(4)$ Polar nuclei

The tissue that attaches the ovule to the inner side of the ovary is called .......

$A$ typical angiosperm embryo sac at maturity is: