In angiosperms since two types of fusions, syngamy and triple fusion take place in __________ the phenomenon is termed double fertilisation.

Options

A. embryosac
B. ovary
C. ovule
D. seed

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks where the two types of fusions, syngamy and triple fusion, occur in angiosperms, which leads to the phenomenon known as double fertilization.

2. **Defining Key Terms:**
- **Syngamy:** This is the fusion of one male gamete with the egg cell (female gamete) to form a zygote.
- **Triple Fusion:** This occurs when the second male gamete fuses with the diploid secondary nucleus, resulting in the formation of a triploid primary endosperm nucleus.

3. **Identifying the Location of Double Fertilization:**
- In angiosperms, both syngamy and triple fusion occur within a specific structure.
- The structure where these processes take place is known as the **embryo sac**.

4. **Eliminating Other Options:**
- **Ovary:** This is the part of the flower that contains the ovules but is not the site of fertilization.
- **Ovule:** This is the structure that develops into a seed after fertilization but does not directly refer to the location of the double fertilization process.
- **Cyst:** This term does not relate to the reproductive structures in flowering plants.

5. **Conclusion:**
Since both types of fusions occur in the embryo sac, the answer to the question is that the phenomenon termed double fertilization takes place in the **embryo sac**.

**Final Answer:**
The phenomenon is termed double fertilization and takes place in the **embryo sac**.

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