Chlorophyllous cells fewer in number,unique is shape with inner walls thicker are

Options

A. Guard cells
B. Passage cells
C. Subsidiary cells
D. Bulliform cells

Answer

To answer the question "Chlorophyllous cells fewer in number, unique in shape with inner walls thicker are," we need to analyze the options provided and identify the correct one based on the characteristics described.

### Step-by-Step Solution:

1. **Understanding the Question**:
- We are looking for a type of chlorophyllous cell that is fewer in number, has a unique shape, and has thicker inner walls.

2. **Analyzing the Options**:
- **Option 1: Guard Cells**
- Guard cells are specialized cells that surround the stomata (the openings on the leaf surface).
- They are typically fewer in number and have a unique "bean" or "kidney" shape.
- The inner walls of guard cells are thicker compared to their outer walls.
- They contain chloroplasts, although fewer and smaller than those in mesophyll cells.
- They play a crucial role in regulating transpiration by controlling the opening and closing of stomata.

- **Option 2: Passage Cells**
- Passage cells are endodermal cells found in older roots.
- They have thin walls and do not fit the criteria of being fewer in number or having a unique shape.

- **Option 3: Subsidiary Cells**
- These cells surround guard cells but do not have thick inner walls and are not fewer in number.

- **Option 4: Bulliform Cells**
- Also known as motor cells, these are large, bubble-shaped epidermal cells found on the upper surface of leaves.
- They are numerous and do not fit the criteria of being fewer in number or having thicker inner walls.

3. **Conclusion**:
- Based on the analysis, the only option that fits all the criteria of being fewer in number, unique in shape, and having thicker inner walls is **Guard Cells**.

### Final Answer:
The correct answer is **Guard Cells**.

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