Submerged hydrophytes have a well developed

Options

A. Vascular system
B. Aerenchyma
C. Root system
D. Stomatal system.

Answer

**Step-by-Step Solution:**

1. **Understanding Submerged Hydrophytes**: Submerged hydrophytes are aquatic plants that grow entirely underwater. They have adaptations that help them survive in an aquatic environment.

2. **Identifying the Options**: The question provides four options regarding what submerged hydrophytes have well-developed:
- Vascular system
- Aerenchyma
- Root system
- Stomatal system

3. **Analyzing Each Option**:
- **Vascular System**: While submerged hydrophytes do have a vascular system, it may not be as well-developed as in terrestrial plants because they do not require extensive support structures.
- **Aerenchyma**: This is a specialized tissue that contains air spaces. It is well-developed in submerged hydrophytes and aids in gas exchange and buoyancy.
- **Root System**: Submerged hydrophytes often have reduced or modified root systems since they absorb nutrients directly from the water.
- **Stomatal System**: Stomata are typically not present in submerged plants as gas exchange occurs through the entire surface of the plant.

4. **Conclusion**: The most well-developed structure in submerged hydrophytes is the aerenchyma, which facilitates gas exchange and provides buoyancy.

5. **Final Answer**: The correct answer is **Aerenchyma**.

---