Dumbell shaped guard cells are found in

Options

A. Gymnosperms
B. Most dicots
C. Cereals
D. Xerophytes

Answer

**Step-by-Step Solution:**

1. **Understanding Guard Cells:**
- Guard cells are specialized cells that surround the stomata (pores) on the surface of leaves. They regulate the opening and closing of these stomata, which is crucial for gas exchange and transpiration in plants.

2. **Identifying Guard Cell Shapes:**
- Guard cells can have different shapes depending on the type of plant. In monocots (plants with one cotyledon), guard cells are typically dumbbell-shaped. In contrast, dicots (plants with two cotyledons) usually have kidney-shaped or bean-shaped guard cells.

3. **Classifying Plants:**
- Monocots include plants such as grasses, lilies, and cereals. Dicots include plants such as roses, sunflowers, and beans.

4. **Focusing on the Question:**
- The question specifically asks about dumbbell-shaped guard cells. Since we established that these are characteristic of monocots, we need to identify a monocot option from the provided choices.

5. **Selecting the Correct Answer:**
- Among the options, cereals (which are monocots) are known to have dumbbell-shaped guard cells. Therefore, the correct answer to the question is that dumbbell-shaped guard cells are found in cereals.

**Final Answer:**
Dumbbell-shaped guard cells are found in cereals (which are monocots).

---