What does the filiform apparatus do at the entrance into ovule?
(1) It guides pollen tube from a synergid to egg
(2) It helps in the entry of pollen tube into a synergid
(3) It prevents entry of more than one pollen tube into the embryosac
(4) It brings about opening of the pollen tube
Sol. Answer (2)
It helps in the entry of pollen tube into synergid : Filiform apparatus is present at the
micropylar end in synergid. It is a mass of finger like projections. It releases certain
chemical substances which direct the path of pollen tube inside the synergid through
micropyle (chemotropic effect)