In which of the following, sporophylls may form distinct compact structures called strobili is found

Options

A. Selaginaella and fuucs
B. Selaginella and Equisetum
C. Fusus and Cycas
D. Pteris and Polysiphonia

Answer

To solve the question regarding which of the following plant groups have sporophylls that may form distinct compact structures called strobili, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Sporophylls** are leaf-like structures that bear sporangia, which produce spores.
- **Strobili** are compact structures formed by the aggregation of sporophylls.

2. **Identify the Plant Groups**:
- The options given are:
1. Sleginella and Fuchus
2. Sleginella and Equicetum
3. Fuchus and Cycus
4. Polysiphonia

3. **Analyze Each Option**:
- **Option 1: Sleginella and Fuchus**:
- Sleginella is a pteridophyte known for forming strobili.
- Fuchus is an algae, which does not form strobili.
- **Conclusion**: Incorrect option.

- **Option 2: Sleginella and Equicetum**:
- Both Sleginella and Equicetum are pteridophytes and are known to form strobili.
- **Conclusion**: Correct option.

- **Option 3: Fuchus and Cycus**:
- Fuchus is algae and does not form strobili.
- Cycus is a gymnosperm and does not form strobili in the same way as pteridophytes.
- **Conclusion**: Incorrect option.

- **Option 4: Polysiphonia**:
- Polysiphonia is also an algae and does not form strobili.
- **Conclusion**: Incorrect option.

4. **Final Answer**:
- The correct answer is **Sleginella and Equicetum** (Option 2), as both of these are pteridophytes that form strobili.