In which of the following plants gametophytic phase is dominant ?

Options

A. Fern
B. Moss/Riccia
C. Angiosperm
D. Cycas.

Answer

To determine which of the following plants has a dominant gametophytic phase, we will analyze the life cycles of the given options, focusing on the alternation of generations.

### Step-by-Step Solution:

1. **Understanding Alternation of Generations**:
- In plants, there are two main phases: the gametophytic phase (haploid) and the sporophytic phase (diploid).
- The gametophyte produces gametes through mitosis, while the sporophyte produces spores through meiosis.

2. **Identifying Plant Groups**:
- Lower plants, such as algae and bryophytes (e.g., mosses), have a dominant gametophytic phase.
- Higher plants, such as ferns, gymnosperms, and angiosperms, have a dominant sporophytic phase.

3. **Evaluating the Options**:
- **Option A: Fern** - Ferns are classified as pteridophytes, which have a dominant sporophytic phase.
- **Option B: Moss** - Mosses are bryophytes, and in mosses, the gametophytic phase is dominant.
- **Option C: Angiosperms** - Angiosperms have a dominant sporophytic phase.
- **Option D: Cycas** - Cycas is a gymnosperm, which also has a dominant sporophytic phase.

4. **Conclusion**:
- Among the options provided, the only plant where the gametophytic phase is dominant is **Moss (Option B)**.

### Final Answer:
The plant in which the gametophytic phase is dominant is **Moss**.

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