Total nuclei involved in double fertilisation are

Options

A. Five
B. Three
C. Two
D. Four

Answer

To determine the total number of nuclei involved in double fertilization, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding Double Fertilization**:
- Double fertilization is a unique process in flowering plants where two fertilization events occur simultaneously.

2. **Identifying the Components**:
- In double fertilization, there are two main processes: syngamy and triple fusion.
- **Syngamy**: This is the fusion of one male gamete with the egg cell.
- **Triple Fusion**: This involves the fusion of two polar nuclei with another male gamete.

3. **Counting the Nuclei**:
- **From Syngamy**:
- The egg cell contributes **1 nucleus**.
- The male gamete contributes **1 nucleus**.
- **From Triple Fusion**:
- The two polar nuclei contribute **2 nuclei**.
- The male gamete involved in this fusion contributes **1 nucleus**.

4. **Total Calculation**:
- Adding these together:
- From syngamy: 1 (egg nucleus) + 1 (male gamete nucleus) = 2 nuclei
- From triple fusion: 2 (polar nuclei) + 1 (male gamete nucleus) = 3 nuclei
- Therefore, the total number of nuclei involved in double fertilization is:
- 2 (from syngamy) + 3 (from triple fusion) = **5 nuclei**.

5. **Conclusion**:
- The total number of nuclei involved in double fertilization is **5**.

### Final Answer:
The total nuclei involved in double fertilization are **5**.

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