Entry of pollen tube through micropyle while reaching the embryo sac is called

Options

A. chalazogamy
B. mesogamy
C. porogamy
D. pseudogamy

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of the Ovule**:
- The ovule is a crucial part of the flowering plant's reproductive system. It contains the embryo sac, which houses the ovum (female gamete). The ovule is protected by integuments and has two ends: the micropilar end (where the pollen tube enters) and the chalazal end.

2. **Identifying the Process**:
- When pollen grains land on the stigma of a flower, they germinate and form a pollen tube. This tube grows down through the style towards the ovule.

3. **Entry Points of Pollen Tube**:
- The pollen tube can enter the embryo sac through different pathways:
- **Chalazogamy**: Entry through the chalazal end.
- **Mesogamy**: Entry through the integuments.
- **Porogamy**: Entry through the micropilar end.

4. **Defining the Correct Term**:
- The question specifically asks for the entry of the pollen tube through the micropyle while reaching the embryo sac. This process is termed **porogamy**.

5. **Understanding Other Terms**:
- **Pseudogamy**: A process where pollination occurs, but there is no fertilization and thus no zygote formation. This is not relevant to the question.

6. **Conclusion**:
- Therefore, the correct answer to the question is **porogamy**, which refers to the entry of the pollen tube through the micropyle into the embryo sac.

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