$A$ mature embryo sac at the final stage of development contains: (in $cells$)

Select the correct option for megasporogenesis.

An ovule with the micropyle near the chalaza is known as:

The three cells present at the chalazal end form $.....P......$,and the three cells present at the micropylar end form $.....Q.....$.
$\quad\quad\quad \quad \text { P } \quad\quad\quad \text { Q }$

What do '$S$' and '$T$' represent in the given figure?

Filiform apparatus is a characteristic feature of