The pollen tube enters the embryo sac through:

In wheat and rice,pollen grains lose viability within $30$ minutes of their release. In members of the families Rosaceae,Leguminosae,and Solanaceae,the viability is maintained for $...$.

The structures which guide the pollen tube into the synergid are:

$A$ pollen tube grows down the style because

Pollen tube discharges its gametes in

Through which cell of the embryo sac does the pollen tube enter the embryo sac?