When the pollen tube enters the ovule through the funiculus or the integuments,it is called:

$A$: Initial growth of the pollen tube takes place at the expense of food present in the stigma and style.
$R$: The pollen tube travels intracellularly and chemotactically.

Which solution can be used to induce the germination of pollen grains and the formation of a pollen tube in plants?

When does fertilization take place in plants?

In angiosperms,the pollen tube enters the embryo sac through:

In which cell's cytoplasm are both male gametes first released?