The pollen tube enters the ovule through

Options

A. antipodal cells
B. micropyle
C. degenerating synergids
D. all of these

Answer

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

### Step-by-Step Solution:

1. **Understanding the Structure of the Ovule**:
- The ovule contains the embryo sac, which is the female gametophyte in angiosperms (flowering plants). It consists of various cells including the egg cell, synergids, and antipodal cells.

2. **Identifying the Ends of the Ovule**:
- The ovule has two ends: the micropilar end and the chalazal end. The micropilar end is where the pollen tube typically enters.

3. **Role of the Pollen Tube**:
- The pollen tube carries two male gametes from the pollen grain. It grows towards the ovule after pollination and penetrates it to deliver the gametes.

4. **Entry Point of the Pollen Tube**:
- The pollen tube specifically enters the ovule through the micropilar end. This is where the synergids and the egg cell are located, facilitating the fertilization process.

5. **Fertilization Process**:
- Once the pollen tube enters through the micropilar end, one male gamete fuses with the egg cell to form a zygote, while the other fuses with the polar nuclei to form the endosperm.

6. **Conclusion**:
- Therefore, the correct answer to the question is that the pollen tube enters the ovule through the micropyle.

### Final Answer:
The pollen tube enters the ovule through the micropyle.