The pollen tube usually enters the embryo sac
Between one synergid and central cell
By directly penetrating the egg
Through one of the synergids
By knocking off the antipodal cells
Triple fusion is characteristic of
$A$ : Triple fusion is associated with the sexual reproduction in all spermatophytes.
$R$ : It is required to form definitive nucleus as nutritive tissue.
Pollen tube discharge its gametes in
Full name : $\mathrm{PEN}$.
In angiosperm, triple fusion is necessary for the formation of