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 options contains sporophylls that may form distinct compact structures called strobili, we can follow these steps:

### Step 1: Understand the Terms
- **Sporophylls**: These are leaf-like structures that bear sporangia, which are responsible for producing spores.
- **Strobili**: These are compact structures formed by the aggregation of sporophylls. They are also known as cones and can be male or female depending on the type of sporangia they contain.

### Step 2: Analyze the Options
1. **Option 1: Seruginella and Fucus**
- Fucus is a brown alga and does not have sporophylls. Therefore, this option is incorrect.

2. **Option 2: Seruginella and Equisetum**
- Equisetum (horsetail) is a pteridophyte that does have strobili formed from sporophylls. This option is a strong candidate.

3. **Option 3: Fucus and Cycas**
- Again, Fucus does not have sporophylls. While Cycas does have strobili, the presence of Fucus makes this option incorrect.

4. **Option 4: Teres and Polysiphonia**
- Polysiphonia is a red alga and does not have sporophylls. Therefore, this option is also incorrect.

### Step 3: Conclusion
- After analyzing the options, the only correct answer is **Option 2: Seruginella and Equisetum**, as Equisetum is known to have sporophylls that form strobili.

### Final Answer
The correct answer is **Option 2: Seruginella and Equisetum**.

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