The pollen tube enters the synergid through :-

Options

A. Lateral walls
B. Filiform apparatus
C. Chalazal end
D. Any of these regions

Answer

To answer the question "The pollen tube enters the synergid through:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Embryo Sac**:
- The embryo sac is the female gametophyte in flowering plants, where the female gametes (egg cells) are located. It is crucial to understand its structure to determine how the pollen tube interacts with it.

2. **Identifying Key Structures**:
- The embryo sac contains several important structures:
- **Micropyle**: The opening through which the pollen tube enters.
- **Synergids**: Two cells located near the micropyle that assist in guiding the pollen tube.
- **Egg Cell**: The female gamete located adjacent to the synergids.
- **Antipodal Cells**: Three cells located at the opposite end of the embryo sac (chalazal end).

3. **Role of the Pollen Tube**:
- The pollen tube carries two male gametes from the pollen grain to the embryo sac. It needs to enter the synergids to facilitate fertilization.

4. **Entry Point of the Pollen Tube**:
- The pollen tube specifically enters the embryo sac through the **micropyle**. This is where the synergids are located, which play a crucial role in guiding the pollen tube.

5. **Function of the Synergids**:
- The synergids have specialized structures called the **filiform apparatus** at their tips. This apparatus helps in guiding the pollen tube into the synergids effectively.

6. **Conclusion**:
- Therefore, the pollen tube enters the synergids through the **filiform apparatus**, which is a structure that facilitates this process.

### Final Answer:
The pollen tube enters the synergid through the **filiform apparatus**.

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