Draw the diagram of a mature embryo sac and show its $8-$ nucleate, $7-$ celled nature. Show the following parts : antipodals, synergids, egg, central cell, polar nuclei.

The ploidy level of nucellus and female gametophyte respectively is

Choose the correct option w.r.t. the function of the germ pore.

$A$ : Chalazal vacuole is present in the help cell of embryo sac.
$R$ : Polarity of synergid cytoplasm is opposite to egg cell.