The role of the filiform apparatus in synergids is to

In the diagram given below,show the path of a pollen tube from the pollen on the stigma into the embryo sac. Name the components of the egg apparatus.

What is the function of the filiform apparatus during the entry of the pollen tube into the ovule?

Identify the correct order of events in pollen-pistil interaction from the options given below.
$I.$ Release of male gametes into the embryo sac
$II.$ Deposition of pollen grains on stigma
$III.$ Entry of pollen tube into embryo sac
$IV.$ Development of pollen tube
$V.$ Entry of pollen tube into the ovule

Germination of pollen grain on the stigma is:

Name the part of the gynoecium that determines the compatible nature of the pollen grain.