Fusion of one male gamete with egg and other of the same pollen tube with two polar nuclei is

Options

A. Triple fusion
B. Vegetative fertilization
C. Double fertilization
D. Parthenogenesis.

Answer

To solve the question regarding the fusion of one male gamete with an egg and the other male gamete with two polar nuclei, we can break down the process as follows:

### Step-by-Step Solution:

1. **Understanding Gametes**: In flowering plants (angiosperms), male gametes are produced in the pollen grains. Each pollen grain contains two male gametes.

2. **Fertilization Process**: The process of fertilization in angiosperms involves two distinct fusions:
- **Syngamy**: This is the first fusion where one male gamete fuses with the egg cell (female gamete). This fusion results in the formation of a zygote, which will develop into the embryo.
- **Triple Fusion**: The second male gamete fuses with the two polar nuclei present in the embryo sac. This fusion results in the formation of a primary endosperm cell, which will develop into the endosperm, a tissue that provides nourishment to the developing embryo.

3. **Definition of Double Fertilization**: The entire process, which includes both syngamy and triple fusion, is referred to as double fertilization. This term specifically describes the occurrence of two fertilization events within the same reproductive process.

4. **Conclusion**: Therefore, the fusion of one male gamete with the egg and the other male gamete with the two polar nuclei is termed as double fertilization.

### Final Answer:
The correct answer to the question is **double fertilization**.

---