The zygote gives rise to proembryo/endosperm.

Answer

### Step-by-Step Solution:

1. **Understanding the Zygote Formation**: The zygote is formed when one male gamete fuses with the egg cell during the process of syngamy. This is the initial step in the fertilization process.

2. **Zygote Development**: After the formation of the zygote, it undergoes a series of mitotic divisions. These divisions lead to the development of the proembryo.

3. **Proembryo Formation**: The zygote develops into a proembryo through cell divisions. The proembryo is the early stage of the embryo that will eventually develop into a mature embryo.

4. **Endosperm Formation**: The second male gamete fuses with the two polar nuclei in the central cell of the embryo sac, leading to the formation of the endosperm. This process is known as triple fusion, resulting in a triploid endosperm.

5. **Conclusion**: Therefore, the zygote specifically gives rise to the proembryo, while the endosperm is formed from the fusion of the second male gamete with the polar nuclei.

### Final Answer:
The zygote gives rise to the proembryo, not the endosperm.

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