Fusion product of polar nuclei is

Options

A. synergids
B. antipodals
C. endosperm nucleus
D. secondary nucleus

Answer

To solve the question regarding the fusion product of polar nuclei, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure**: The polar nuclei are located in the central cell of the embryo sac. The embryo sac is a structure in the ovule of flowering plants that contains the female gametes.

**Hint**: Remember that the embryo sac is a key structure in plant reproduction, specifically in angiosperms.

2. **Understand the Fusion**: The two polar nuclei present in the central cell of the embryo sac undergo fusion. This fusion results in the formation of a structure known as the secondary nucleus.

**Hint**: Think about how the fusion of nuclei contributes to the formation of new structures in plant reproduction.

3. **Recognize the Next Step**: The secondary nucleus (which is diploid due to the fusion of the two haploid polar nuclei) then fuses with one of the male gametes (which is haploid) during fertilization.

**Hint**: Consider the role of male gametes in fertilization and how they interact with the female structures.

4. **Formation of Endosperm**: The fusion of the secondary nucleus with the male gamete forms the primary endosperm nucleus, which is triploid (2n from the polar nuclei + 1n from the male gamete). This primary endosperm nucleus eventually develops into the endosperm tissue that nourishes the developing embryo.

**Hint**: Recall the significance of endosperm in seed development and its nutritional role.

5. **Conclusion**: Therefore, the fusion product of the polar nuclei is the secondary nucleus, which later contributes to the formation of the endosperm nucleus after fertilization.

**Final Answer**: The correct answer to the question is **endosperm nucleus**.

### Summary of Key Points:
- Polar nuclei are found in the central cell of the embryo sac.
- They fuse to form the secondary nucleus.
- The secondary nucleus fuses with a male gamete to form the primary endosperm nucleus.
- The endosperm nucleus is the final product that develops into the endosperm.