What does the filiform apparatus do at the entrance into ovule?

Options

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

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure**: The filiform apparatus is a specialized structure found at the micropilar end of the synergids in the embryo sac of flowering plants.

2. **Role of Filiform Apparatus**: The primary function of the filiform apparatus is to facilitate the process of fertilization by guiding the pollen tube towards the egg cell.

3. **Opening of Pollen Tube**: When the pollen tube reaches the synergids, the filiform apparatus helps in the opening of the pollen tube, allowing the male gametes to be released.

4. **Guiding the Pollen Tube**: The filiform apparatus plays a crucial role in directing the pollen tube from the synergids to the egg cell, ensuring that the male gametes reach their target.

5. **Preventing Multiple Entries**: The filiform apparatus also helps to prevent the entry of more than one pollen tube into the embryo sac, ensuring that fertilization occurs with only one pollen grain.

6. **Conclusion**: In summary, the filiform apparatus is essential for the successful fertilization process in flowering plants by guiding the pollen tube, facilitating its entry into the synergids, and preventing multiple pollen tubes from entering the embryo sac.