Most distinct type of alternation of generations is demonstrated by :–

Options

A. Angiosperms
B. Ferns
C. Gymnosperms
D. Bryophytes

Answer

To determine which group of plants demonstrates the most distinct type of alternation of generations, we can analyze the life cycles of the given options: Angiosperms, Ferns, Gymnosperms, and Bryophytes.

### Step-by-Step Solution:

1. **Understanding Alternation of Generations**:
- Alternation of generations is a biological process where a plant alternates between two distinct forms: the haploid gametophyte and the diploid sporophyte.

2. **Examining Bryophytes**:
- In Bryophytes (like mosses), the dominant stage is the gametophyte, which is haploid. The sporophyte is dependent on the gametophyte and is typically smaller and shorter-lived.

3. **Examining Ferns**:
- In Ferns, the life cycle includes a dominant sporophyte stage, which is diploid. The sporophyte produces spores that develop into a haploid gametophyte (prothallus). The gametophyte produces gametes (antherozoids and archegonia), which fuse to form a diploid zygote, leading to the sporophyte stage.

4. **Examining Gymnosperms**:
- Gymnosperms also have a dominant sporophyte stage, but their alternation of generations is less distinct than that of ferns because the gametophyte is reduced and dependent on the sporophyte.

5. **Examining Angiosperms**:
- Angiosperms have a similar pattern to gymnosperms, with a dominant sporophyte stage and reduced gametophytes. The alternation of generations is not as distinct as in ferns.

6. **Conclusion**:
- Among the options, ferns exhibit the most distinct alternation of generations because the transition between the dominant sporophyte and the independent gametophyte is clear and pronounced. Thus, the answer is **Ferns** (Option 2).

### Final Answer:
The most distinct type of alternation of generations is demonstrated by **Ferns**.