Which is CORRECT for the ferm Dryopteris ?

Options

A. Sporophyte is partially dependent on gametophyte
B. Sporophyte is independent
C. Gametophyte is independent
D. Both (B) and (C)

Answer

To determine which statement is correct for the fern Dryopteris, we need to analyze the characteristics of its life cycle and the relationship between its sporophyte and gametophyte stages.

### Step-by-Step Solution:

1. **Understanding Dryopteris**:
- Dryopteris is a type of pteridophyte, commonly known as the wooden fern or male fern. Pteridophytes are vascular plants that reproduce via spores.

2. **Life Cycle of Pteridophytes**:
- Pteridophytes exhibit a life cycle that alternates between two generations: the sporophyte and the gametophyte.
- The sporophyte is the diploid phase (2n) that produces spores through meiosis.
- The gametophyte is the haploid phase (n) that develops from the spores and produces gametes.

3. **Independence of Sporophyte and Gametophyte**:
- In Dryopteris, both the sporophyte and gametophyte are independent and free-living. This means they can exist separately and do not rely on each other for survival.
- The sporophyte is not dependent on the gametophyte for nutrition or support, which is a key characteristic of pteridophytes.

4. **Analyzing the Options**:
- **Option A**: "Sporophyte is partially dependent on gametophyte." - This is incorrect because the sporophyte is independent.
- **Option B**: "Sporophyte is independent." - This is correct.
- **Option C**: "Gametophyte is independent." - This is also correct.
- **Option D**: "Both B and C." - Since both B and C are correct, this option is also correct.

5. **Conclusion**:
- The correct answer is **Option D**, which states that both the sporophyte and gametophyte are independent.