The movement of the pollen tube is called:

What is the function and location of the filiform apparatus in synergids?

$A$ pollen tube grows down the style because

In some cereals like wheat and rice, pollen grains lose viability within a certain period of their release. In members of the families $Rosaceae$, $Leguminosae$, and $Solanaceae$, the viability is maintained for a different period. Choose the correct option for these two periods respectively.

Where does the pollen tube develop?

Which of the following stimulates pollen germination and pollen tube growth?