What does the filiform apparatus do at the entrance of the ovule?

Question

What does the filiform apparatus do at the entrance of the ovule?, It brings about opening of the pollen tube., It helps in the entry of pollen tube into a synergid., It prevents entry of more than one pollen tube into the embryo sac., It guides pollen tube from a synergid to egg.

MARKS App · Accepted Answer

Within the embryo sac, three cells are grouped together at the micropylar end and constitute the egg apparatus. The egg apparatus, in turn, consists of two synergids and one egg cell. The synergids have special cellular thickenings at the micropylar tip called filiform apparatus, which plays an important role in guiding the pollen tubes into the synergid. Three cells are at the chalazal end and are called the antipodals. The large central cell has two polar nuclei.

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