Which of the following have sunken stomata

Options

A. Nerium
B. Hydrilla
C. Mango
D. Guava

Explanation

To determine which of the given plants have sunken stomata, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Stomata**: Stomata are small openings on the surface of leaves that facilitate gas exchange (carbon dioxide and oxygen) and transpiration (loss of water).

2. **Identify the Function of Sunken Stomata**: Sunken stomata are adaptations found in certain plants to reduce water loss, especially in arid environments. They are located in deep pits on the leaf surface, which helps to minimize water loss by creating a microenvironment that retains moisture.

3. **Analyze the Options**:
- **Mango**: A terrestrial plant that does not have sunken stomata. It has normal stomata on the leaf surface.
- **Guava**: Similar to mango, guava is also a terrestrial plant with normal stomata.
- **Hydrilla**: An aquatic plant (hydrophyte) that does not require adaptations like sunken stomata because it is surrounded by water.
- **Nerium**: A xerophyte that grows in dry habitats and has adaptations to conserve water, including sunken stomata.

4. **Conclusion**: Based on the analysis, the plant that has sunken stomata is **Nerium**, as it is adapted to dry conditions and uses sunken stomata to reduce water loss.

### Final Answer:
**Nerium** is the plant that has sunken stomata.

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