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 determine which of the following pairs is mismatched, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Hypostomatic:**
- **Definition:** A leaf is termed hypostomatic when the stomata are predominantly located on the lower epidermis.
- **Analysis:** This definition is accurate. Therefore, option A is correctly matched.

2. **Understanding Epistomatic:**
- **Definition:** A leaf is termed epistomatic when the stomata are predominantly located on the upper epidermis.
- **Analysis:** This definition is also accurate. Therefore, option B is correctly matched.

3. **Understanding Amphistomatic:**
- **Definition:** Amphistomatic leaves have stomata on both the upper (adaxial) and lower (abaxial) surfaces. However, it is commonly understood that the number of stomata can vary, and in many cases, the lower surface has more stomata than the upper surface.
- **Analysis:** The statement in the question suggests that amphistomatic stomata are non-functional, which is incorrect. Amphistomatic stomata are functional and serve the purpose of gas exchange. Therefore, option C is mismatched.

4. **Conclusion:**
- Based on the analysis, the mismatched pair is option C, which incorrectly states that amphistomatic stomata are non-functional.

### Final Answer:
The mismatched pair is **option C**: Amphistomatic stomata are non-functional.