Which of the following statements is not true regarding the `C_(4)` plants ?

Options

A. They show kranz anatomy
B. Decarboxylation process occurs in bundle sheath cells
C. Granal chloroplast is present in bundle sheath cells.
D. PEPcase enzyme activity occurs in mesophyll cells.

Answer

To determine which statement is not true regarding C4 plants, we can analyze the provided statements step by step.

### Step-by-Step Solution:

1. **Understanding C4 Plants**:
- C4 plants utilize a specific pathway for photosynthesis known as the Hatch-Slack pathway. This pathway is adapted for environments with high temperatures and low moisture.

2. **Analyzing Each Statement**:
- **Statement 1**: C4 plants exhibit Kranz anatomy.
- **True**: C4 plants have a unique leaf structure called Kranz anatomy, where the mesophyll cells surround the bundle sheath cells.

- **Statement 2**: Decarboxylation occurs in bundle sheath cells.
- **True**: In C4 plants, decarboxylation does occur in the bundle sheath cells, where the C4 acid is converted to CO2 for the Calvin cycle.

- **Statement 3**: Grana chloroplasts are present in bundle sheath cells.
- **Not True**: This statement is incorrect. Grana chloroplasts, which are involved in the light-dependent reactions, are primarily found in the mesophyll cells, not in the bundle sheath cells.

- **Statement 4**: Phosphoenolpyruvate carboxylase (PEP carboxylase) activity occurs in mesophyll cells.
- **True**: PEP carboxylase is the enzyme that initially fixes CO2 in the mesophyll cells of C4 plants.

3. **Conclusion**:
- The statement that is not true regarding C4 plants is that grana chloroplasts are present in the bundle sheath cells.

### Final Answer:
The statement that is not true regarding C4 plants is: **Grana chloroplasts are present in the bundle sheath cells.**

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