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What does the filiform apparatus do at the entrance into ovule?
A
It brings about opening of the pollen tube
B
It guides pollen tube from a synergid to egg
C
It helps in the entry of pollen tube into a synergid
D
It prevents entry of more than one pollen tube into the embryo sac
Detailed Solution
The egg apparatus at the micropylar end of the embryo sac consists of one egg cell and two synergids.
The synergids have special cellular thickenings at the micropylar tip, called the filiform apparatus.
The filiform apparatus plays an important role in guiding the pollen tube into the synergid.
After entering the ovule through the micropyle, the pollen tube enters one of the synergids through the filiform apparatus and releases the two male gametes there.
It does not open the pollen tube, it does not guide the tube from the synergid to the egg, and it has no role in blocking additional pollen tubes.
So the filiform apparatus helps in the entry of the pollen tube into a synergid.
The synergids have special cellular thickenings at the micropylar tip, called the filiform apparatus.
The filiform apparatus plays an important role in guiding the pollen tube into the synergid.
After entering the ovule through the micropyle, the pollen tube enters one of the synergids through the filiform apparatus and releases the two male gametes there.
It does not open the pollen tube, it does not guide the tube from the synergid to the egg, and it has no role in blocking additional pollen tubes.
So the filiform apparatus helps in the entry of the pollen tube into a synergid.