Triple fusion, occurring in embryo sac results in formation of

Options

A. Diploid PEN
B. Triploid PEN
C. Diploid zygote
D. Polyploid zygote

Answer

**Step-by-Step Solution:**

1. **Understanding the Process of Fertilization:**
- In flowering plants, fertilization occurs when a pollen tube delivers two male gametes into the embryo sac.
- One male gamete fuses with the egg cell, leading to the formation of a diploid zygote. This process is known as syngamy.

2. **Identifying the Second Male Gamete:**
- The second male gamete, which is still present in the embryo sac, does not participate in the formation of the zygote.
- Instead, it migrates towards the secondary nucleus (which is diploid, formed by the fusion of two polar nuclei).

3. **Triple Fusion:**
- The fusion of the second male gamete with the secondary nucleus is termed triple fusion.
- This results in the formation of a triploid nucleus because the secondary nucleus is diploid (2n) and the male gamete is haploid (n).

4. **Formation of Primary Endosperm Nucleus:**
- The result of this triple fusion is the formation of a triploid primary endosperm nucleus (PEN), which is crucial for the development of the endosperm that nourishes the developing embryo.

5. **Conclusion:**
- Therefore, the outcome of triple fusion occurring in the embryo sac is the formation of a triploid primary endosperm nucleus (PEN).

**Final Answer:**
The result of triple fusion occurring in the embryo sac is the formation of a triploid primary endosperm nucleus (PEN).

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