Male and female gametophytes are independent and free-living in

Options

A. Mustard
B. Castor
C. Pinus
D. Sphagnum

Answer

To solve the question "Male and female gametophytes are independent and free-living in," we need to analyze the options provided and understand the characteristics of the organisms mentioned.

### Step-by-Step Solution:

1. **Understanding Gametophytes**:
- Gametophytes are the haploid phase in the life cycle of plants that produce gametes (sperm and eggs). In some plants, these gametophytes can be independent and free-living.

2. **Analyzing the Options**:
- **Option 1: Mustard**: Mustard is an angiosperm (flowering plant). In angiosperms, the gametophyte stage is highly reduced and dependent on the sporophyte (the main plant body).
- **Option 2: Castor**: Castor is also an angiosperm. Similar to mustard, its gametophytes are reduced and depend on the sporophyte.
- **Option 3: Pinus**: Pinus is a gymnosperm. In gymnosperms, the gametophytes are also dependent on the sporophyte and are not free-living.
- **Option 4: Sphagnum**: Sphagnum is a bryophyte (moss). In bryophytes, the gametophyte is the dominant phase of the life cycle and is independent and free-living.

3. **Conclusion**:
- Based on the analysis, the correct answer is **Option 4: Sphagnum**. In Sphagnum, both male and female gametophytes are independent and free-living.

### Final Answer:
**Sphagnum (Option 4)**

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