The shape of guard cells of Poaceae members is

Options

A. Banana shape
B. Bean shape
C. Fusiform
D. Dumb-bell shape

Answer

To determine the shape of guard cells in members of the Poaceae family, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Guard Cells**:
- Guard cells are specialized cells that surround stomata (the pores on the leaf surface) and are responsible for regulating gas exchange and transpiration in plants.

2. **Identifying Stomata Types**:
- Stomata can have different shapes of guard cells depending on the plant species. The two common shapes are kidney bean shape and dumbbell shape.

3. **Focusing on Poaceae Members**:
- Poaceae is the botanical family that includes grasses. It is important to note that the shape of guard cells can vary among different plant families.

4. **Researching Guard Cell Shapes in Poaceae**:
- In members of the Poaceae family, the guard cells are specifically noted to be of a dumbbell shape, which is distinct from the kidney bean shape found in many other plants.

5. **Conclusion**:
- Based on the information gathered, the correct answer to the question regarding the shape of guard cells in Poaceae members is that they are of **dumbbell shape**.

### Final Answer:
The shape of guard cells of Poaceae members is **dumbbell shape**.

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