In $Capsella$,the functional megaspore is always located at the........

Filiform apparatus is a characteristic feature of$-$

With a neat,labelled diagram,describe the parts of a mature angiosperm embryo sac. Mention the role of synergids.

How many ovules are present in each ovary of a maize flower?

In the $Polygonum$ type of embryo sac,all cells are .....

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: