Fusion a male gamete with the secondary nucleus forms the

Options

A. Zygote
B. Embryo
C. Seed
D. Endosperm

Answer

To answer the question "Fusion of a male gamete with the secondary nucleus forms the," we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding the Structure of the Embryo Sac**:
- The embryo sac contains several important structures, including the egg cell, two synergids, three antipodal cells, and a central cell that contains two polar nuclei.

2. **Identifying the Male Gamete**:
- The male gamete is produced in the pollen grains. When pollen grains land on the stigma of a flower, they germinate and release two male gametes.

3. **Double Fertilization Process**:
- In flowering plants, a unique process called double fertilization occurs. One male gamete fuses with the egg cell to form the zygote, while the other male gamete fuses with the two polar nuclei in the central cell.

4. **Formation of the Endosperm**:
- The fusion of one male gamete with the two polar nuclei (which are haploid) results in the formation of the endosperm, which is triploid (3n).

5. **Final Outcomes**:
- Therefore, the fusion of a male gamete with the secondary nucleus (the central cell with two polar nuclei) forms the endosperm, while the fusion with the egg cell forms the zygote.

### Conclusion:
- The correct answer to the question is that the fusion of a male gamete with the secondary nucleus forms the **endosperm**.

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