Choose the correct statement

Options

A. `C_(4)` plants do not have Rubisco
B. carboxylation of RuBP leads to the formation of PGA and phosphoglycolate
C. Carboxylation of phosphoenol pyruvaye results in the formation of `C_(4)` acids
D. Carboxylation of `C_(4)` acids occur in mesophyll cells

Answer

To solve the question "Choose the correct statement," we will analyze each of the provided statements regarding photosynthesis, particularly focusing on C4 plants and the Calvin cycle.

### Step-by-Step Solution:

1. **Evaluate the First Statement**:
- The statement claims that "C4 plants do not have Rubisco."
- **Analysis**: Rubisco is an enzyme that is present in C4 plants, specifically in the bundle sheath cells where the Calvin cycle occurs. Therefore, this statement is **incorrect**.

2. **Evaluate the Second Statement**:
- The statement claims that "carboxylation of RuBP leads to the formation of PGA and phosphoglycolate."
- **Analysis**: In the Calvin cycle, the carboxylation of RuBP (ribulose bisphosphate) indeed leads to the formation of 3-phosphoglycerate (3-PGA) and not phosphoglycolate. Hence, this statement is also **incorrect**.

3. **Evaluate the Third Statement**:
- The statement claims that "carboxylation of phosphoenolpyruvate results in the formation of C4 acids."
- **Analysis**: The carboxylation of phosphoenolpyruvate (PEP) does lead to the formation of oxaloacetic acid, which is indeed a C4 acid. This statement is therefore **correct**.

4. **Evaluate the Fourth Statement**:
- The statement claims that "carboxylation of C4 acids occurs in mesophyll cells."
- **Analysis**: C4 acids, such as oxaloacetic acid, are formed in the mesophyll cells, but they are then transported to the bundle sheath cells for further processing. Therefore, this statement is **incorrect**.

### Conclusion:
From the analysis, the only correct statement is the third one: "carboxylation of phosphoenolpyruvate results in the formation of C4 acids."

### Final Answer:
The correct statement is: **Carboxylation of phosphoenolpyruvate results in the formation of C4 acids.**

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