. Which of the following is true for primary endosperm nucleus (PEN) :-

Options

A. Fusion of two polar nuclei and one male gamete
B. Fusion of one synergid and two polar nuclei
C. Fusion of two antipodal and one male gamete
D. Fusion of one male gamete one synergids and one antipodal cell

Answer

To answer the question regarding the Primary Endosperm Nucleus (PEN), we will follow these steps:

### Step-by-Step Solution:

1. **Understanding the Primary Endosperm Nucleus (PEN)**:
- The Primary Endosperm Nucleus is formed during the fertilization process in flowering plants. It is created when one male gamete (from the pollen grain) fuses with two polar nuclei present in the embryo sac.

2. **Identifying the Components**:
- In the embryo sac, there are several components: two polar nuclei, one egg cell, and two synergids, along with three antipodal cells. The polar nuclei are crucial for the formation of the PEN.

3. **Fertilization Process**:
- During fertilization, one pollen grain delivers two male gametes. One male gamete fertilizes the egg cell, resulting in the formation of a zygote (2n), while the other male gamete fuses with the two polar nuclei (2n + 2n) to form the Primary Endosperm Nucleus (3n).

4. **Analyzing the Options**:
- Option A: Fusion of two polar nuclei and one male gamete - **This is correct**.
- Option B: Fusion of two synergids and two polar nuclei - **This is incorrect**.
- Option C: Fusion of two antipodals and one male gamete - **This is incorrect**.
- Option D: Fusion of one male gamete, one synergid, and one antipodal - **This is incorrect**.

5. **Conclusion**:
- The correct statement regarding the Primary Endosperm Nucleus is that it is formed by the fusion of two polar nuclei and one male gamete, making the correct answer Option A.

### Final Answer:
The correct option for the Primary Endosperm Nucleus (PEN) is: **Fusion of two polar nuclei and one male gamete (Option A)**.

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