In `C_4` plants enzymes of PCR cycle are present in

Options

A. Mesophyll cells
B. Bundle sheath cells
C. (1) & 2
D. None

Answer

### Step-by-Step Solution:

1. **Understanding C4 Plants**: C4 plants utilize a specific pathway for photosynthesis known as the C4 pathway or the Hatch-Slack pathway. This pathway is adapted to high light intensity, high temperatures, and low CO2 concentrations.

2. **Identifying the Key Components**: The C4 pathway involves two types of cells: mesophyll cells and bundle sheath cells. The enzymes involved in the photosynthetic carbon reduction (PCR) cycle, also known as the Calvin cycle, are crucial for the fixation of CO2.

3. **Role of Mesophyll Cells**: In C4 plants, the initial fixation of CO2 occurs in the mesophyll cells. Here, CO2 is combined with phosphoenolpyruvate (PEP) to form oxaloacetic acid (OAA). This process is facilitated by the enzyme PEP carboxylase.

4. **Transport to Bundle Sheath Cells**: The OAA produced in the mesophyll cells is then converted to malate or aspartate, which is transported to the bundle sheath cells.

5. **Enzymatic Activity in Bundle Sheath Cells**: The enzymes of the PCR cycle, which include ribulose bisphosphate carboxylase/oxygenase (RuBisCO) and others, are located in the bundle sheath cells. This is where the decarboxylation of the transported compounds occurs, leading to the release of CO2 for the Calvin cycle.

6. **Conclusion**: Therefore, the enzymes of the PCR cycle in C4 plants are primarily located in the bundle sheath cells.

### Final Answer:
The enzymes of the PCR cycle in C4 plants are present in **bundle sheath cells**.

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