Independent alternation of generation is present in

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding Alternation of Generations**:
- In plant life cycles, there are two distinct phases: the haploid gametophyte phase and the diploid sporophyte phase. These phases alternate to complete the life cycle.

2. **Identifying the Generations**:
- The gametophyte generation is haploid (n) and produces gametes (sperm and eggs).
- The sporophyte generation is diploid (2n) and produces spores through meiosis.

3. **Analyzing the Options**:
- **Endosperms**: This is a tissue produced in the seeds of flowering plants and is not a separate generation.
- **Gymnosperms**: In gymnosperms, the sporophyte is dominant and the gametophyte is dependent on it.
- **Pteridophytes**: In pteridophytes (like ferns), both the gametophyte and sporophyte are independent and free-living.
- **Bryophytes**: In bryophytes, the gametophyte is the dominant form and the sporophyte is dependent on it.

4. **Conclusion**:
- The only group where both generations are independent and free-living is the **pteridophytes**. Therefore, the correct answer is pteridophytes.

### Final Answer:
Independent alternation of generation is present in **pteridophytes**.

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