The number of nuclei taking part in double fertilization are

Options

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

Answer

To solve the question regarding the number of nuclei taking part in double fertilization, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Double Fertilization**:
- Double fertilization is a unique process that occurs in angiosperms (flowering plants). It involves the fusion of two male gametes (sperm cells) with different nuclei in the female gametophyte (embryo sac).

2. **Identify the Components Involved**:
- In the embryo sac, there is one egg cell (female gamete) and two polar nuclei (which together form the central cell).

3. **Count the Nuclei**:
- The first male gamete fuses with the egg cell, forming the zygote. This accounts for **1 nucleus** (the egg cell).
- The second male gamete fuses with the central cell, which is made up of **2 polar nuclei**. This fusion creates the triploid endosperm, which accounts for **2 additional nuclei**.

4. **Total Nuclei Participating**:
- Adding these together:
- 1 (from the egg cell) + 2 (from the central cell) + 2 (from the two male gametes) = **5 nuclei** in total.

5. **Conclusion**:
- Therefore, the total number of nuclei participating in double fertilization is **5**.

### Final Answer:
The number of nuclei taking part in double fertilization is **5**.

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