Dumbell shaped structures in grasses is

Options

A. Stoma
B. Guard cell
C. Substidary cell
D. Stomatal complex

Answer

To answer the question "Dumbbell shaped structures in grasses is," we need to analyze the options provided and understand the relevant biological concepts.

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking about the specific structures in grasses that are shaped like dumbbells.

2. **Identify the Options**: The options given are:
- a) Stoma
- b) Guard cell
- c) Subgerari cell
- d) Stomatal complex

3. **Define Each Option**:
- **Stoma**: This refers to the tiny openings on the surface of leaves that allow for gas exchange. It is not a structure itself but rather the opening formed by guard cells.
- **Guard Cell**: These are specialized cells that surround each stoma and control its opening and closing. In grasses (monocots), these guard cells are shaped like dumbbells.
- **Subgerari Cell**: This term is not commonly used in plant biology and may be a typographical error or confusion with another term.
- **Stomatal Complex**: This term refers to the entire structure that includes the stoma and the guard cells.

4. **Focus on Grasses**: In grasses (which are monocots), the guard cells are distinctively shaped like dumbbells. This is a key characteristic that differentiates them from dicots, where guard cells are typically bean-shaped.

5. **Conclusion**: Based on the analysis, the correct answer to the question is **b) Guard cell**, as these are the dumbbell-shaped structures found in grasses.

### Final Answer:
The dumbbell shaped structures in grasses is **Guard cell**.