The fusion of male and female gametes in the embryo sac is called

Options

A. Triple fusion
B. Syngamy
C. Double fertilisation
D. Zooidogamy

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the process that occurs when the male and female gametes fuse within the embryo sac of a flowering plant.

2. **Identifying the Gametes**: In the embryo sac, there are two types of gametes involved in fertilization: the male gamete (pollen) and the female gamete (ovule).

3. **Process of Fusion**: The fusion of the male gamete with the female gamete is a crucial step in sexual reproduction. This process is specifically referred to as "syngamy."

4. **Clarifying Related Terms**:
- **Triple Fusion**: This occurs when one male gamete fuses with the two polar nuclei in the central cell of the embryo sac, resulting in a triploid cell. This is not the answer to the question.
- **Double Fertilization**: This term refers to the overall process in angiosperms where one male gamete fuses with the female gamete (syngamy) and the other male gamete fuses with the polar nuclei (triple fusion). This is also not the answer to the question.
- **Zoidogamy**: This is a type of fertilization that occurs in aquatic plants where male gametes swim to the female gametes. This does not apply to the embryo sac context.

5. **Conclusion**: The correct term for the fusion of male and female gametes in the embryo sac is "syngamy."

**Final Answer**: The fusion of male and female gametes in the embryo sac is called **syngamy**.

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