In mesogamy, pollen tube enters the ovule through

Options

A. Middle of integuments after piercing the tissues
B. Middle of integuments without piercing the tissues
C. Chalaza
D. Middle of micropyle.

Answer

**Step-by-Step Solution:**

1. **Understanding Mesogamy**: Mesogamy refers to a specific type of fertilization process in plants where the pollen tube enters the ovule through a particular structure.

2. **Identifying the Structure**: The structure through which the pollen tube enters the ovule in mesogamy is called the entubament. This is a protective covering surrounding the ovule.

3. **Entry Process**: In mesogamy, the pollen tube enters the ovule laterally. This means it approaches from the side rather than from the top or bottom.

4. **Piercing the Tissue**: As the pollen tube enters the ovule, it pierces through the tissues of the entubament. This is a crucial detail as it distinguishes mesogamy from other types of gametophyte interactions.

5. **Final Destination**: After piercing the entubament, the pollen tube ultimately reaches the embryo sac, which is located at the micropilar pole of the ovule.

6. **Conclusion**: Therefore, the correct answer to the question is that in mesogamy, the pollen tube enters the ovule through the middle of the entubament after piercing the tissues.

**Final Answer**: In mesogamy, the pollen tube enters the ovule through the middle of the entubament after piercing the tissues.

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