Which out of the following is a MISMATCHED pair ?

Options

A. Hypostomatic - Stomata present more on lower epidermis than on upper epidermis
B. Epistomatic - Stomata present more on upper epidermis than on lower epidermis
C. Amphistomatic - Stomata non - functional
D. Sunken stomata - Stomata deep seated below the surface

Answer

To solve the question of which pair is mismatched, we need to analyze each of the given pairs related to stomata and their characteristics.

### Step-by-Step Solution:

1. **Understanding Stomata**:
- Stomata are small openings on the surface of leaves that facilitate gas exchange and transpiration. They are surrounded by guard cells that regulate their opening and closing.

2. **Analyzing Each Pair**:
- **Hypostomatic**: This refers to leaves that have more stomata on the lower epidermis than on the upper epidermis. This statement is correct.
- **Epistomatic**: This refers to leaves that have more stomata on the upper epidermis than on the lower epidermis. This statement is also correct.
- **Amphistomatic**: This term describes leaves that have stomata on both the upper and lower surfaces. The statement mentions "stomata non-functional," which is incorrect because amphistomatic leaves have functional stomata on both surfaces.
- **Sunken Stomata**: This refers to stomata that are located below the surface of the leaf, which helps reduce water loss. This statement is correct.

3. **Identifying the Mismatched Pair**:
- The third option, which describes amphistomatic leaves as having "stomata non-functional," is incorrect. Amphistomatic leaves do have functional stomata on both surfaces.

### Conclusion:
The mismatched pair is the third option related to amphistomatic leaves.