A plant in your garden avoids photorespiratory losses, has improved water use efficiency shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the followubg physiological groups would you assign this plant

Options

A. C-3
B. C-4
C. CAM
D. Nitrogen fixer

Answer

To solve the question, we need to analyze the characteristics of the plant mentioned and compare them with the physiological groups provided: C3 plants, C4 plants, CAM plants, and nitrogen-fixing plants.

### Step-by-Step Solution:

1. **Identify the Characteristics of the Plant:**
- The plant avoids photorespiratory losses.
- It has improved water use efficiency.
- It shows high rates of photosynthesis at high temperatures.
- It has improved efficiency of nitrogen utilization.

2. **Understand Photorespiration:**
- Photorespiration is a process that occurs in C3 plants when the enzyme RuBisCO reacts with oxygen instead of carbon dioxide, leading to a loss of energy and carbon. C4 plants have mechanisms to minimize photorespiration.

3. **Evaluate Water Use Efficiency:**
- C4 plants are known for their improved water use efficiency compared to C3 plants. This is because they can fix carbon dioxide more efficiently under conditions of drought or limited water supply.

4. **High Rates of Photosynthesis at High Temperatures:**
- C4 plants are adapted to high-temperature environments and can maintain high rates of photosynthesis even when temperatures rise. This is in contrast to C3 plants, which tend to suffer from decreased photosynthesis rates at high temperatures.

5. **Nitrogen Utilization:**
- While both C3 and C4 plants utilize nitrogen, C4 plants are often more efficient in utilizing nitrogen due to their specialized leaf anatomy and metabolic pathways.

6. **Conclusion:**
- Based on the characteristics listed, the plant in question exhibits traits that are typical of C4 plants. They are adapted to avoid photorespiration, are more efficient in water use, can photosynthesize effectively at higher temperatures, and utilize nitrogen more efficiently.

### Final Answer:
The plant belongs to the **C4 plant** physiological group.

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