Which of the following in female gametophyte of an angiosperm helps in guiding the pollen tube for fertilizing the eggs ?

In the female gametophyte (embryo sac) of an angiosperm, the synergids possess special cellular thickenings at the micropylar tip called the filiform apparatus.

The filiform apparatus plays a crucial role in guiding the pollen tube into the synergid for the release of male gametes during fertilization.