What is the function of filiform apparatus in an angiospermic embryo sac ?

Guides the pollen tube into a synergid .

The function of the filiform apparatus in an angiospermic embryo sac is to guide the pollen tube into a synergid.

During fertilization in angiosperms, pollen tubes grow towards the embryo sac to deliver the male gametes (sperm cells). The filiform apparatus is a specialized structure located at the micropylar end of the embryo sac. It consists of elongated cells that protrude into the micropyle, which is the opening of the embryo sac.

The filiform apparatus plays a crucial role in guiding the pollen tube toward the synergid cells within the embryo sac. The synergid cells are located adjacent to the egg cell and play a role in attracting and guiding the pollen tube. The filiform apparatus directs the pollen tube towards the synergid, facilitating the precise delivery of the sperm cells to the egg cell for fertilization.