In organism with haplontic life cycle, zygote divides by

Options

A. Mitosis to form haploid spores
B. Meiosis to form gametes
C. Mitosis to form gametes
D. Meiosis to form haploid spores

Answer

To answer the question "In organisms with a haplontic life cycle, the zygote divides by," we need to understand the characteristics of the haplontic life cycle.

### Step-by-Step Solution:

1. **Understanding the Haplonitic Life Cycle**:
- In organisms with a haplontic life cycle, the dominant stage is the haploid phase. This means that the main plant body is haploid, containing only one set of chromosomes.

2. **Formation of Gametes**:
- The haploid organism produces gametes (sperm and egg cells) through mitosis. However, the crucial point is that gametes are not formed from the zygote.

3. **Zygote Formation**:
- When male and female gametes fuse during fertilization, they form a diploid zygote. The zygote is a temporary structure that contains two sets of chromosomes.

4. **Division of the Zygote**:
- The zygote undergoes division to develop into the next stage of the life cycle. In haplontic organisms, this division is not mitosis; instead, it is meiosis.

5. **Meiosis of the Zygote**:
- The zygote undergoes meiosis to produce haploid spores. These spores will eventually grow into new haploid individuals.

6. **Conclusion**:
- Therefore, in organisms with a haplontic life cycle, the zygote divides by meiosis to form haploid spores.

### Final Answer:
The zygote divides by **meiosis to form haploid spores**.

---