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 Double Fertilization**: In angiosperms, a unique process called double fertilization occurs. This involves the fusion of two male gametes with different nuclei in the embryo sac.

2. **First Male Gamete Fusion**: The first male gamete fuses with the egg nucleus, resulting in the formation of a diploid zygote. This process is known as syngamy or fertilization.

3. **Second Male Gamete Fusion**: The second male gamete migrates towards the two polar nuclei present in the embryo sac. This fusion is known as triple fusion.

4. **Formation of Primary Endosperm Nucleus**: The fusion of the second male gamete with the secondary nucleus (formed by the fusion of two polar nuclei) results in the formation of a primary endosperm nucleus.

5. **Nature of the Primary Endosperm Nucleus**: The primary endosperm nucleus formed through triple fusion is triploid (3n), not diploid (2n). This triploid nucleus eventually develops into the endosperm, which nourishes the developing embryo.

6. **Conclusion**: Therefore, the correct answer to the question is that triple fusion occurring in the embryo sac results in the formation of a triploid primary endosperm nucleus.

**Final Answer**: Triple fusion occurring in the embryo sac results in the formation of a triploid primary endosperm nucleus.

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