Which pteridophyte is called as horse-tail

Options

A. Equisetum
B. Lycopodium
C. Marsilea
D. Selaginella

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks which pteridophyte is commonly known as horsetail.

2. **Understand Pteridophytes**: Pteridophytes are a group of vascular plants that reproduce via spores and do not produce seeds. They include ferns, horsetails, and clubmosses.

3. **Review the Options**: The options provided are:
- A) Equisetum
- B) Lycopodium
- C) Mycelia
- D) Salaginella

4. **Analyze Each Option**:
- **A) Equisetum**: This is a genus of plants that is commonly known as horsetail. It has jointed stems and is often found in wet environments.
- **B) Lycopodium**: This is known as clubmoss, not horsetail.
- **C) Mycelia**: This term does not refer to any pteridophyte; it is more associated with fungi.
- **D) Salaginella**: This is known as spikemoss, not horsetail.

5. **Conclusion**: Based on the analysis, the correct answer is A) Equisetum, which is commonly referred to as horsetail.

**Final Answer**: Equisetum is the pteridophyte commonly known as horsetail.

---