Choose the correct statement.

Options

A. The `C_(4)`- plants do not have RuBisCO.
B. Carboxylation of RuBP leads to the formation of PGA and phosphoglycolate
C. Carboxylation of phosphoenolpyruvate results in the formation of oxalic acid in `C_(4)-` plants.
D. Decarboxylation of `C_(4)-` acids occur in the mesophyll cells.

Answer

To solve the question "Choose the correct statement," we will analyze each of the provided statements regarding C4 plants and their photosynthesis pathway.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- **Statement:** "C4 plants do not have Rubisco."
- **Explanation:** C4 plants do have Rubisco, but it is primarily located in the bundle sheath cells where the Calvin cycle (C3 pathway) occurs. Therefore, this statement is **incorrect**.

2. **Analyze the Second Statement:**
- **Statement:** "Carboxylation of RUBP leads to the formation of TGA and phosphoglycolate."
- **Explanation:** The carboxylation of Ribulose bisphosphate (RUBP) in the Calvin cycle leads to the formation of 3-phosphoglycerate (PGA), not phosphoglycolate. Therefore, this statement is also **incorrect**.

3. **Analyze the Third Statement:**
- **Statement:** "Carboxylation of phosphoenolpyruvate results in the formation of oxalic acid in the C4 plants."
- **Explanation:** The carboxylation of phosphoenolpyruvate (PEP) does lead to the formation of oxaloacetic acid (OAA) in C4 plants, but it is important to note that the carbon is derived from bicarbonate (HCO3-) rather than CO2 directly. However, this statement is generally considered **correct** in the context of the C4 pathway.

4. **Analyze the Fourth Statement:**
- **Statement:** "Decarboxylation of C4 acids occurs in the mesophyll cells."
- **Explanation:** Decarboxylation of oxaloacetic acid occurs in the bundle sheath cells, not in the mesophyll cells. Thus, this statement is **incorrect**.

### Conclusion:
The only statement that holds true in the context of C4 plants is the third statement: "Carboxylation of phosphoenolpyruvate results in the formation of oxalic acid in the C4 plants."

### Final Answer:
**The correct statement is:** "Carboxylation of phosphoenolpyruvate results in the formation of oxalic acid in the C4 plants."

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