What is the collective term for the events starting from the deposition of pollen grains on the stigma to the entry of the pollen tube into the ovule?

Pollen tube at the time of entering the embryo sac has:

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

Identify the correct sequence of events of pollen-pistil interaction given below.
$(a)$ Pollen tube grows through the stigma,style and reaches the ovule.
$(b)$ Pollen grain lands on the stigma.
$(c)$ Pollen germinates to form pollen tube.
$(d)$ Pollen tube carrying $2$ male gametes enters the ovule.
Choose the correct option.

Pollen-pistil interaction is:

The entry of the pollen tube into the ovule through the micropyle is called .....