Select the mismatched pair

Options

A. (a) Root hair-Unicellular
B. (b) Stem hair-multicellular
C. (c) trichomes-cause water loss
D. (d) guard cells-regulate opening and closing of stomata

Explanation

To solve the question of selecting the mismatched pair, we will analyze each option provided:

### Step-by-Step Solution:

1. **Examine Option A: Root Hair Unicellular**
- Root hairs are indeed unicellular extensions of the root epidermis.
- **Conclusion:** This pair is correct.

2. **Examine Option B: Stem Hair Multicellular**
- Stem hairs (often referred to as trichomes) are multicellular extensions of the stem epidermis.
- **Conclusion:** This pair is also correct.

3. **Examine Option C: Trichomes Cause Water Loss**
- Trichomes are structures that can be unicellular or multicellular and are derived from the epidermis.
- Their primary function is protective, and they help prevent water loss by creating a barrier and working in conjunction with the cuticle.
- **Conclusion:** This pair is mismatched because trichomes do not cause water loss; they prevent it.

4. **Examine Option D: Guard Cells Regulate Opening and Closing of Stomata**
- Guard cells are specialized cells that surround the stomatal pores and are responsible for regulating their opening and closing.
- **Conclusion:** This pair is correct.

### Final Conclusion:
- After analyzing all options, the mismatched pair is **Option C: Trichomes Cause Water Loss**.