The life cycle of Selaginella/Fern/Moss is

Options

A. Diplontic
B. Haplo-diplontic
C. Haplontic
D. Diplo-haplontic.

Answer

### Step-by-Step Solution:

1. **Understanding the Organisms**:
- Selaginella and Fern are classified as pteridophytes, while Moss is classified as a bryophyte.
- Pteridophytes are vascular plants that reproduce via spores, while bryophytes are non-vascular plants.

2. **Identifying Life Cycle Types**:
- The life cycles of plants can be categorized into three main types:
- Diplontic: Dominant diploid phase.
- Haplodiplontic: Alternation of generations with both haploid and diploid phases.
- Haplontic: Dominant haploid phase.
- Diplohaplontic: A mix of both haploid and diploid phases where both generations are prominent.

3. **Analyzing the Life Cycle of Pteridophytes (Selaginella and Fern)**:
- In pteridophytes, the life cycle begins with spores (haploid).
- These spores germinate to form a gametophyte (haploid).
- The gametophyte produces gametes (haploid).
- Fertilization occurs, forming a zygote (diploid).
- The zygote develops into a sporophyte (diploid), which eventually produces spores, completing the cycle.

4. **Analyzing the Life Cycle of Bryophytes (Moss)**:
- In mosses, the life cycle also includes a dominant gametophyte (haploid).
- The gametophyte produces gametes (haploid).
- Fertilization leads to the formation of a zygote (diploid).
- The zygote develops into a sporophyte (diploid), which is dependent on the gametophyte.

5. **Conclusion**:
- Both Selaginella (pteridophyte) and Moss (bryophyte) exhibit a life cycle that includes both haploid and diploid phases.
- The dominant phase in Selaginella and Fern is diploid (sporophyte), while in Moss, the dominant phase is haploid (gametophyte).
- Therefore, the correct classification for the life cycles of Selaginella, Fern, and Moss is **Diplohaplontic**, as they exhibit both haploid and diploid phases.

### Final Answer:
The life cycle of Selaginella, Fern, and Moss is **Diplohaplontic**.