Question

Which part is responsible for guiding the pollen tube into synergid ?

Hint:

"Filiform" means "thread-like." Think of it as a set of chemical "traffic signs" for the growing pollen tube.

Answer 1

Step 1: Understanding the Concept:
The pollen tube must find its way through the style and into the tiny opening of the ovule (micropyle). Once there, it needs a specific signal to enter the embryo sac.
Step 2: Detailed Explanation:
Synergids are the "helper cells" located at the micropylar end.
They possess finger-like cellular thickenings known as the filiform apparatus.
This apparatus acts like a "beacon"; it secretes chemotropic chemicals that attract the pollen tube and provide a physical guide for the tube to enter one of the synergids to release its male gametes.
Step 3: Final Answer:
The filiform apparatus, located within the synergids, is responsible for guiding the pollen tube.