Velamen tissue is present in the roots of :

Options

A. orchids
B. all epiphytes
C. parasites
D. saprophytes

Explanation

**Step-by-Step Solution:**

1. **Understanding Velamen Tissue**: Velamen is a specialized tissue found in the roots of certain plants. It is spongy in nature and serves to protect the plant from water loss and helps in the absorption of water and nutrients.

2. **Identifying the Types of Plants**: The question provides four options: orchids, epiphytes, parasites, and saprophytes. We need to determine which of these types of plants have velamen tissue in their roots.

3. **Analyzing Each Option**:
- **Orchids**: Orchids are a type of epiphyte. They often have velamen tissue in their roots, which helps them absorb moisture from the air and protects them from desiccation.
- **Epiphytes**: While velamen tissue is found in some epiphytes, not all epiphytes possess it. Therefore, this option is too broad.
- **Parasites**: Parasites do not have velamen tissue. They depend on their host for nutrients and do not have the same adaptations as epiphytes.
- **Saprophytes**: Saprophytes feed on dead or decaying organic matter and do not have velamen tissue.

4. **Conclusion**: Based on the analysis, the correct answer is **Orchids**, as they specifically possess velamen tissue in their roots.

**Final Answer**: Velamen tissue is present in the roots of **Orchids**.

---