Mechanical tissue is undeveloped in

Options

A. Xerophytes
B. Hydrophytes
C. Halophytes
D. Mesophytes.

Answer

To solve the question "Mechanical tissue is undeveloped in," we will analyze each option provided: xerophytes, hydrophytes, halophytes, and mesophytes.

### Step-by-Step Solution:

1. **Understanding Mechanical Tissue**:
- Mechanical tissue in plants provides structural support and strength. It is important for plants to maintain their shape and withstand environmental stresses.

2. **Analyzing Xerophytes**:
- Xerophytes are plants adapted to dry environments. They have well-developed mechanical tissues to support their structure and help them conserve water. Therefore, mechanical tissue is not undeveloped in xerophytes.

3. **Analyzing Hydrophytes**:
- Hydrophytes are plants that grow in water. These plants often have poorly developed or absent mechanical tissues because the buoyancy of water supports their structure. They typically consist of loosely organized, thin-walled cells that do not require additional support. Hence, mechanical tissue is least developed in hydrophytes.

4. **Analyzing Halophytes**:
- Halophytes are plants that thrive in saline environments. They may have some mechanical tissue development to cope with their environment, but they are not primarily characterized by undeveloped mechanical tissues.

5. **Analyzing Mesophytes**:
- Mesophytes are plants that grow in moderate environments. They generally have well-developed mechanical tissues to support their structure, similar to xerophytes.

6. **Conclusion**:
- Based on the analysis, the correct answer is that mechanical tissue is undeveloped in **hydrophytes**.

### Final Answer:
Mechanical tissue is undeveloped in **hydrophytes**.