The entry of pollen tube into the ovule through micropyle is called

Options

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

Answer

To answer the question, "The entry of pollen tube into the ovule through micropyle is called:", we need to analyze the options provided and understand the terminology used in the context of plant reproduction.

### Step-by-Step Solution:

1. **Understanding the Structure of the Ovule**:
- The ovule consists of various parts, including the micropyle and chalaza. The micropyle is a small opening at one end of the ovule, which allows the entry of the pollen tube.

2. **Identifying the Process**:
- The process of the pollen tube entering the ovule occurs through the micropyle. This is a crucial step in fertilization, as it allows the sperm cells to reach the egg cell within the ovule.

3. **Analyzing the Options**:
- **Porogamy**: This term specifically refers to the entry of the pollen tube into the ovule through the micropyle.
- **Mesogamy**: This term is not commonly used in this context and does not refer to the entry of the pollen tube.
- **Anisogamy**: This term refers to the fusion of two different types of gametes and is unrelated to the entry of the pollen tube.
- **Chelazogamy**: This term refers to the entry of the pollen tube through the chalaza, which is opposite to the micropyle.

4. **Conclusion**:
- Based on the definitions and the structure of the ovule, the correct answer is **Porogamy**, as it specifically describes the entry of the pollen tube through the micropyle.

### Final Answer:
The entry of pollen tube into the ovule through micropyle is called **Porogamy**.