Select an incorrect statement

Options

A. Guard cells are dumb-bell shaped in monocots
B. Inner wall of the guard cell is thin and elastic in dicots
C. Cellulosic microfibriles are arranged radilly in guard cells
D. Guard cells ar surrounded by subsidiary cells

Answer

### Step-by-Step Text Solution:

1. **Understanding the Statements**: We need to evaluate the four statements provided about guard cells in plants, specifically comparing monocots and dicots.

2. **Analyzing the First Statement**:
- The first statement claims that guard cells are dumbbell-shaped in monocots.
- This is **correct**. In monocots, guard cells indeed have a dumbbell shape.

3. **Analyzing the Second Statement**:
- The second statement asserts that the inner wall of the guard cells is thin and elastic in dicots.
- This is **incorrect**. In dicots, the inner wall of the guard cells is actually thick, while the outer wall is thinner and more elastic.

4. **Analyzing the Third Statement**:
- The third statement mentions that cellulosic microfibrils are arranged radially in the guard cells.
- This is **correct**. In both monocots and dicots, the microfibrils are arranged radially, aiding in the function of the guard cells.

5. **Analyzing the Fourth Statement**:
- The fourth statement states that guard cells are surrounded by subsidiary cells.
- This is **correct**. Guard cells are indeed surrounded by subsidiary or epidermal cells.

6. **Conclusion**: After analyzing all statements, the only incorrect statement is the second one, which claims that the inner wall of the guard cells in dicots is thin and elastic.

### Final Answer:
The incorrect statement is: "The inner wall of the guard cells is thin and elastic in the dicot."

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