A pollen tbe enters the ovule through chalaza lying opposite the micropyle. It will enter the embryo sac through

Options

A. Chalazal end
B. Laterally
C. Antipodal haustorium
D. Micropylar end.

Answer

To solve the question regarding how a pollen tube enters the embryo sac after entering the ovule through the chalaza, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Structure**: The ovule has several parts, including the micropyle, chalaza, and integuments. The micropyle is the opening through which the pollen tube typically enters.

2. **Identifying the Pathway**: The question states that the pollen tube enters through the chalaza, which is opposite the micropyle. This indicates that we are considering a specific type of fertilization pathway.

3. **Types of Fertilization Pathways**:
- **Porogamy**: This is when the pollen tube enters the ovule through the micropyle. It is the most common pathway in angiosperms.
- **Mesogamy**: This occurs when the pollen tube enters through the integument or funiculus.
- **Chalazogamy**: This is when the pollen tube enters through the chalazal end of the ovule.

4. **Determining the Correct Pathway**: Since the question specifies that the pollen tube enters through the chalaza, we are looking at the chalazogamy pathway.

5. **Final Entry into the Embryo Sac**: Regardless of the pathway taken (chalazogamy in this case), the pollen tube will ultimately reach the embryo sac through the micropyle.

### Conclusion:
Thus, the pollen tube will enter the embryo sac through the **micropyle**.