`CO_2` acceptor in `C_3` plants is

Options

A. Xylulose–5–phosphate
B. 3–phosphoglyceric acid
C. Ribulose 1, 5–diphosphate
D. Phosphoenol pyruvic acid

Explanation

To determine the CO₂ acceptor in C₃ plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding C₃ Photosynthesis**:
- C₃ plants utilize the Calvin cycle for photosynthesis, where carbon dioxide (CO₂) is fixed into organic molecules.

2. **Identifying the CO₂ Accepting Molecule**:
- In the Calvin cycle, the initial step involves the fixation of CO₂. The molecule that accepts CO₂ is crucial for this process.

3. **Recognizing the Key Molecule**:
- The primary CO₂ acceptor in C₃ plants is ribulose 1,5-bisphosphate (RUBP). This molecule combines with CO₂ to form an unstable six-carbon compound.

4. **Formation of 3-Phosphoglyceric Acid**:
- The unstable six-carbon compound quickly breaks down into two molecules of 3-phosphoglyceric acid (3-PGA).

5. **Conclusion**:
- Therefore, the CO₂ acceptor in C₃ plants is ribulose 1,5-bisphosphate (RUBP).

### Final Answer:
The CO₂ acceptor in C₃ plants is ribulose 1,5-bisphosphate (RUBP).

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