Zygote of an organism developed after syngamy undergoes meiosis to form haploid spores, which divide mitotically and form the gametophyte. The organism must have ____ life cycle.

Options

A. haplontic
B. diplontic
C. haplodiplontic
D. either (a) and (c )

Answer

To determine the type of life cycle an organism has based on the information provided, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Syngamy and Zygote Formation**:
- Syngamy refers to the fusion of two gametes (sperm and egg) to form a zygote. This zygote is diploid, meaning it contains two sets of chromosomes.

2. **Meiosis in the Zygote**:
- The question states that the zygote undergoes meiosis. Meiosis is a type of cell division that reduces the chromosome number by half, resulting in the formation of haploid spores.

3. **Formation of Haploid Spores**:
- After meiosis, the zygote produces haploid spores. These spores are crucial as they will give rise to the next generation.

4. **Mitotic Division of Spores**:
- The haploid spores then divide mitotically. Mitosis is a process that allows for the growth and development of cells without changing the chromosome number. This means the spores will produce more haploid cells.

5. **Development of Gametophyte**:
- The mitotic division of the haploid spores leads to the formation of the gametophyte. The gametophyte is the haploid stage of the organism's life cycle, which will eventually produce gametes.

6. **Identifying the Life Cycle**:
- In the described life cycle, the main form is haploid (the gametophyte), and the diploid zygote is only present for a short period. This aligns with the characteristics of a haplontic life cycle, where the dominant phase is haploid.

7. **Conclusion**:
- Based on the analysis, the organism must have a **haplontic life cycle**.

### Final Answer:
The organism must have a **haplontic life cycle**.

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