Question

Function of filiform apparatus is to
A. Recognize the suitable pollen of stigma
B. Stimulate division of generative cell
C. Produce nectar
D. Guide the entry of pollen tube

Answer 1

Hint:- A finger-like projection composed of an enclosed nucleus of microfibrils in a sheath is the filiform apparatus. The filiform apparatus is analogous to the transfer cells, meaning the short-distance transport of metabolites.

Complete Answer:- The filiform apparatus is an extremely thickened synergy cell wall structure at the end of the micropylar, consisting of multiple finger-like projections into the synergy cytoplasm. Synergies are necessary for the cessation of the growth of pollen tubes and the release of sperm cells. The filiform apparatus is called the synergid cell wall that forms an incredibly thick structure at the end of the micropylar. It holds multiple finger-like projections into the cytoplasm-synergy system.
That is part of the egg sac. In higher plants, it allows the male gamete to enter the egg cell to fertilise it. The role of the filiform apparatus is to direct pollen tube entry and sperm cell release.
From these discussions we can conclude that the function of the filiform apparatus is to guide the entry of the pollen tube.

Therefore the correct answer is option (D).

Note:- Synergid cells are two specialised cells in the female angiosperm gametophyte that lie adjacent to the egg cell and play an important role in the guidance and operation of the pollen tube. The synergies are also essential for the cessation of the development of the pollen tube and the release of the sperm cells.