Which one of the following does not perform `C_(4)` photosynthesis ?

Options

A. Saccharum
B. Zea mays
C. Triticum aestivum
(= T. vulgare)/(Crotalaria)
D. Euphorbia milli (=E. splendens).

Answer

To determine which of the following does not perform C4 photosynthesis, we need to understand the characteristics of C4 and C3 plants.

### Step-by-Step Solution:

1. **Understand C4 Photosynthesis**:
- C4 plants utilize a specific pathway known as the Hatch-Slack pathway. This pathway allows them to efficiently fix carbon dioxide in hot and dry environments.
- They produce a four-carbon compound (oxaloacetic acid) as the first stable product of photosynthesis.

2. **Identify C3 Photosynthesis**:
- C3 plants, on the other hand, utilize the Calvin cycle for photosynthesis. Their first stable product is a three-carbon compound (3-phosphoglycerate or PGA).
- C3 plants are typically found in cooler and wetter climates.

3. **Examples of C3 and C4 Plants**:
- Common examples of C3 plants include wheat, oats, and rice.
- C4 plants include maize (corn), sugarcane, and certain species of Euphorbia.

4. **Analyze the Given Options**:
- The question provides several options, including:
- Saccharum (sugarcane)
- Euphorbia (a genus that includes C4 species)
- Triticum (wheat)
- From our knowledge, Saccharum and Euphorbia are both C4 plants, while Triticum (wheat) is a C3 plant.

5. **Conclusion**:
- Since Triticum (wheat) does not perform C4 photosynthesis, the correct answer to the question is Triticum aestivum.

### Final Answer:
Triticum aestivum does not perform C4 photosynthesis.

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