Velamen is

Options

A. Single layered
B. Bilayered
C. Multi layered
D. None of these

Answer

### Step-by-Step Solution:

1. **Understanding Velamen**: Velamen is a specialized tissue found in the roots of certain epiphytic plants, particularly orchids. It serves as a protective layer.

2. **Structure of Velamen**: Velamen is characterized as a multi-layered structure. It consists of several layers of cells that form a spongy epidermis.

3. **Function of Velamen**: The primary function of velamen is to absorb atmospheric moisture and nutrients. This is particularly important for epiphytic plants that grow on other plants and may not have direct access to soil.

4. **Association with Other Organisms**: Velamen is often associated with symbiotic fungi or bacteria, which can help in nutrient fixation from the air, enhancing the plant's ability to thrive in its environment.

5. **Conclusion**: Based on the characteristics and functions of velamen, we conclude that it is a multi-layered structure.

6. **Answer Selection**: The correct answer to the question "Velamen is" is "multi-layered".

### Final Answer:
Velamen is multi-layered.

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