Question

What does the filiform apparatus do at the entrance into the ovule. It

• A. Prevents entry of more than one pollen tube into the embryo sac
• B. Guides the pollen tube from synergid to egg
• C. Brings about opening of pollen tube
• D. Helps in entry of pollen tube into synergid

Answer 1

The correct option is D Helps in entry of pollen tube into synergid

Filiform apparatus
Pollen tube enters the embryo sac through the synergid cells. Synergid cells secrete chemicals and direct the entry of the pollen tube inside the embryo sac.

The filiform apparatus are finger-like projections present in the cytoplasm of synergids localised at the micropylar tip. These comprise of an ensheathed microfibrillar core that guides the movement over short distances.
After the entry of the pollen tube into the ovule, the filiform apparatus directs the pollen tube inside the embryo sac in the synergids.

Final answer
(c) helps in entry of pollen tube into synergid