Chalazal pole is present
Opposite to micropyle
At the origin of integuments
Opposite to nucellus
Near the embryo sac
$A$ : Filiform apparatus guides the pollen tube into the synergids.
$R$ : It is special cellular thickening at micropylar tip to secrete chemotropic stimulus.
Embryo sac is
Two nuclei with one cell are found in
Identify the labelled part $X, Y$ and $Z$ from the given figure :
$X-Y-Z$
Perisperm is