Select an incorrect statement

Options

A. Guard cells are dumb-bell shaped in Poaceae
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 are bordered by one or more subsidiary cells

Answer

**Step-by-Step Text Solution:**

1. **Understanding Guard Cells**:
- Guard cells are specialized cells that surround the stomatal pores on the surface of leaves. Their main function is to regulate the opening and closing of these pores, which is essential for gas exchange and transpiration.

2. **Analyzing the Statements**:
- We need to evaluate each statement provided in the question to determine which one is incorrect.

3. **Statement 1**: "Guard cell a dumbbell shaped in poise."
- This statement is true. Guard cells are indeed shaped like a dumbbell or crescent, which allows them to open and close the stomatal pore effectively.

4. **Statement 2**: "Inner wall of the guard cell is thin and elastic in dicots."
- This statement is incorrect. The inner wall of the guard cells is actually thick and not elastic. The thick inner wall helps in the opening of the stomatal pore during transpiration.

5. **Statement 3**: "Cellulosic microfibrils are arranged radially in guard cells."
- This statement is true. The arrangement of cellulosic microfibrils in a radial pattern is known as radial mycelation, which is crucial for the function of guard cells.

6. **Statement 4**: "Guard cells are bordered by one or more subsidiary cells."
- This statement is also true. Guard cells are typically surrounded by subsidiary cells that assist in their function.

7. **Conclusion**:
- After evaluating all the statements, the incorrect statement is the second one: "Inner wall of the guard cell is thin and elastic in dicots."

**Final Answer**: The incorrect statement is: "Inner wall of the guard cell is thin and elastic in dicots."

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