Which of the following is not special about `C_(4)` plants ?

Options

A. Responsiveness to high light intensities
B. Presence of Photorespiration
C. Greater productivity
D. Narrow stomatal pores

Answer

To determine which of the following is not special about C4 plants, we need to analyze the characteristics and processes associated with C4 plants compared to C3 plants. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understand C3 and C4 Plants**:
- C3 plants primarily use the Calvin cycle (C3 cycle) for photosynthesis. They have a tendency to undergo photorespiration due to the enzyme Rubisco fixing oxygen instead of carbon dioxide under certain conditions.
- C4 plants, such as sugarcane, have adapted to minimize photorespiration by using a different pathway (C4 cycle) to concentrate carbon dioxide in bundle sheath cells.

2. **Identify Key Features of C4 Plants**:
- C4 plants possess a unique leaf anatomy known as Kranz anatomy, which includes specialized bundle sheath cells that contain chloroplasts.
- They are efficient in fixing carbon dioxide and do not undergo photorespiration, which enhances their productivity, especially in high light and temperature conditions.

3. **Evaluate the Options**:
- The question asks which of the following characteristics is **not** special about C4 plants.
- One of the characteristics mentioned is the presence of photorespiration. Since C4 plants are specifically adapted to avoid photorespiration, this characteristic is not special about them.

4. **Conclusion**:
- The correct answer is that the presence of photorespiration is **not** a special feature of C4 plants. Instead, it is a characteristic of C3 plants.

### Final Answer:
The characteristic that is not special about C4 plants is the presence of photorespiration.

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