Question

What is the function of the filiform apparatus at the entrance into ovule?

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

Answer 1

Answer: (B)

Helps in the entry of pollen tube into a synergid

A fully developed typical or polygonum type of embryo sac is a large and oval structure consisting of 7 cells and 8 nuclei.

Egg apparatus- this is a group of 3 cells situated at the micropylar end. The centrally located cell is known as the egg cell. On its sides are present two synergids. An egg cell has a large vacuole at its upper end and a prominent nucleus near its lower end. Synergids show of filiform apparatus attached to the upper wall. It is known to attract and guide the pollen tube. Each of the synergies has a vacuole at its lower end and the nucleus at its upper end.

So, the correct option is 'Helps in the entry of the pollen tube into a synergid'.