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Embryo Sac and Pollen-Pistil Interaction
Concepts tested here
- Filiform apparatus of synergids
All Questions
2008 AIPMT 1 question
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What does the filiform apparatus do at the entrance into ovule?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.