The correct statement about stomata is

Options

A. Guard cells are often dumb bell shaped in dicots and bean shaped in monocots
B. Guards cells are epidermal cells with chloroplasts
C. The inner wall of the guard cells is thin while the outer wall is thick
D. The subsidiary cells are epidermal cells with chloroplasts

Answer

To determine the correct statement about stomata, we will analyze each of the provided statements one by one.

### Step 1: Analyze the First Statement
**Statement:** Guard cells are often dumbbell-shaped in dicots and bean-shaped in monocots.

**Analysis:**
- This statement is incorrect.
- Guard cells are typically kidney-shaped (or bean-shaped) in both dicots and monocots, not dumbbell-shaped in dicots.

### Step 2: Analyze the Second Statement
**Statement:** Guard cells are epidermal cells with chloroplasts.

**Analysis:**
- This statement is correct.
- Guard cells originate from epidermal cells and do contain chloroplasts, which are essential for photosynthesis and regulating gas exchange.

### Step 3: Analyze the Third Statement
**Statement:** The inner wall of the guard cell is thin while the outer wall is thick.

**Analysis:**
- This statement is incorrect.
- The inner wall of the guard cell is actually thicker than the outer wall. The thick inner wall helps in the regulation of the stomatal opening.

### Step 4: Analyze the Fourth Statement
**Statement:** The subsidiary cells are epidermal cells with chloroplasts.

**Analysis:**
- This statement is incorrect.
- Subsidiary cells (or companion cells) do not contain chloroplasts and do not perform photosynthesis. They assist in the function of guard cells but are not involved in photosynthesis.

### Conclusion
After analyzing all four statements, the only correct statement is the second one: **Guard cells are epidermal cells with chloroplasts.**

### Final Answer
The correct statement about stomata is: **Guard cells are epidermal cells with chloroplasts.**

---