A tissue present on the outside of epiphytic roots and required for water absorption is

Options

A. Chlorenchyma
B. Velamen
C. Exodermis
D. Epiblema.

Answer

To answer the question, "A tissue present on the outside of epiphytic roots and required for water absorption is," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Epiphytic Roots**:
- Epiphytic plants are those that grow on other plants but do not derive nutrients from them. Instead, they absorb moisture and nutrients from the air and rain.

2. **Identifying the Tissue**:
- The tissue that is specifically found on the outside of epiphytic roots is crucial for their function. This tissue must aid in water absorption.

3. **Recognizing the Function of the Tissue**:
- The tissue in question not only helps in water absorption but also serves protective functions and reduces water loss.

4. **Naming the Tissue**:
- The correct name for the tissue that serves these purposes in epiphytic roots is "velamen." Velamen is a specialized tissue that helps in the absorption of water and is found on the outer surface of these roots.

5. **Eliminating Incorrect Options**:
- Other tissues mentioned, such as collenchyma, exodermis, and epiblema, do not fulfill the same role as velamen in epiphytic roots.
- **Collenchyma**: Primarily provides support and is not involved in water absorption.
- **Exodermis**: Located inside the root and does not serve the outer protective function.
- **Epiblema**: Refers to root hairs, which are not present on epiphytic roots.

6. **Conclusion**:
- Based on the above analysis, the correct answer to the question is "velamen."

### Final Answer:
The tissue present on the outside of epiphytic roots and required for water absorption is **velamen**.

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