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 Structure of the Embryo Sac**:
- The embryo sac consists of several components: synergids, egg cell, central cell, and antipodal cells.
- The synergids are located at one end of the embryo sac, specifically at the micropilar end.

2. **Identifying the Micropilar End**:
- The micropilar end is where the pollen tube will enter the embryo sac. This is the region where the synergids and the egg cell are located.

3. **Role of Synergids**:
- The synergids have specialized structures known as the filiform apparatus. These are finger-like projections that help in guiding the pollen tube towards the synergids.

4. **Entry of the Pollen Tube**:
- The pollen tube does not enter through the lateral walls or the chalazal end of the embryo sac. Instead, it specifically enters through the micropilar region, facilitated by the filiform apparatus of the synergids.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the pollen tube enters the synergid through the **filiform apparatus** located at the micropilar end.

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

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