Select the correct statement regarding the first stable product formed in Hatch and slack pathway in `C_(4)` plants.

Options

A. Oxaloacetate is formed by carboxylation of phosphoenol pyruvate (PEP) in the bundle sheath cells.
B. Oxaloacelate is formed by carboxylation of phosphoenol pyruvate (PEP) in the mesophyll cells.
C. Phosphoglyceric acid is formed in the mesophyll cells.
D. Phosphoglyceric acid is formed in the bundle sheath cells.

Answer

To answer the question regarding the first stable product formed in the Hatch and Slack pathway (C4 pathway) in C4 plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding C4 Plants**: C4 plants have a unique photosynthetic pathway that involves two types of cells: mesophyll cells and bundle sheath cells.

2. **Identifying the First Step**: The first step in the C4 pathway involves the carboxylation of phosphoenolpyruvate (PEP) to form oxaloacetate (also known as oxaloacetic acid).

3. **Location of Reaction**: This carboxylation reaction occurs in the mesophyll cells, where the enzyme phosphoenolpyruvate carboxylase (PEPCase) catalyzes the reaction.

4. **Formation of Oxaloacetate**: The product of this reaction, oxaloacetate, is a four-carbon compound, which is the first stable product formed in the C4 pathway.

5. **Distinguishing Between Options**:
- Option 1 states that oxaloacetate is formed in the bundle sheath cells, which is incorrect.
- Option 2 correctly states that oxaloacetate is formed by the carboxylation of phosphoenolpyruvate in the mesophyll cells.
- Option 3 mentions phosphoglyceric acid being formed in the mesophyll cells, which is also incorrect as it is formed in the bundle sheath cells.
- Option 4 states that phosphoglyceric acid is formed in the bundle sheath cells, which is true, but it does not address the first stable product of the C4 pathway.

6. **Conclusion**: The correct statement regarding the first stable product formed in the Hatch and Slack pathway in C4 plants is that oxaloacetate is formed by the carboxylation of phosphoenolpyruvate in the mesophyll cells.

### Final Answer:
The correct option is **Option 2**: Oxaloacetate is formed by the carboxylation of phosphoenolpyruvate in the mesophyll cell.

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