Fusion of a male gamete with egg in embryo sac is

Options

A. Autogamy
B. Syngamy
C. Triple fusion
D. Parthenocarpy

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the fusion of a male gamete with an egg in the embryo sac. This process is a key part of sexual reproduction in flowering plants (angiosperms).

2. **Identifying the Structures**: In angiosperms, the female gametophyte is known as the embryo sac. The embryo sac contains several cells, including the egg cell, which is the female gamete.

3. **Process of Fertilization**: When pollen grains land on the stigma of a flower, they germinate and form a pollen tube. This tube grows down through the style to the ovule, where the embryo sac is located.

4. **Fusion of Gametes**: The pollen tube carries two male gametes. One of these male gametes fuses with the egg cell in the embryo sac. This specific fusion is referred to as **syngamy**.

5. **Formation of the Zygote**: The fusion of the male gamete with the egg cell results in the formation of a zygote, which is the initial cell of the new organism.

6. **Conclusion**: Therefore, the fusion of a male gamete with the egg in the embryo sac is called **syngamy**.