Fertilization involving carrying of male gametes by pollen tube is

Options

A. Porogamy
B. Siphonogamy
C. Chalazogamy
D. Syngonogamy.

Answer

To solve the question regarding fertilization involving the carrying of male gametes by the pollen tube, we need to analyze the options provided and understand the definitions of each term.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the type of fertilization that involves the transportation of male gametes (sperm) through a pollen tube.

2. **Analyzing the Options**:
- **Option 1: Porogamy**: This term refers to the fertilization process where the pollen tube enters the ovule through the micropyle. While it involves the pollen tube, it does not specifically emphasize the carrying of male gametes.
- **Option 2: Siponogamy**: This term describes a condition in plants where the pollen tube develops to transfer male gametes to the eggs. This directly matches the requirement of the question, as it specifically involves the carrying of male gametes via the pollen tube.
- **Option 3: Chalazogamy**: This refers to the entry of the pollen tube into the ovule through the chalazal tissue. Similar to porogamy, it does not focus on the transportation of male gametes.
- **Option 4: Singonogamy**: This term is not commonly used in the context of fertilization and does not apply here.

3. **Identifying the Correct Answer**: Based on the definitions analyzed, **Siponogamy** is the correct answer as it specifically refers to the process of transferring male gametes via the pollen tube to the egg.

### Final Answer:
The correct answer is **Siponogamy**.