In sugarcane plant , which of the following enzymes is responsible for the fixation on of `.^(14)CO_2` in malic acid ?

Options

A. Fructose phosphatase
B. Ribulose bisphosphate carboxylase
C. Phosphoenol pyruvic acid carboxylase
D. Ribulose phosphate kinase

Answer

To solve the question regarding which enzyme is responsible for the fixation of \(^{14}CO_2\) in malic acid in sugarcane plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**:
- Sugarcane is a C4 plant, which means it has a specific pathway for carbon fixation that is different from C3 plants.

2. **Identify the Process**:
- In C4 plants, carbon dioxide is initially fixed in the mesophyll cells before it enters the Calvin cycle in the bundle sheath cells.

3. **Know the Key Enzyme**:
- The enzyme responsible for the initial fixation of carbon dioxide in C4 plants is called PEP carboxylase (Phosphoenolpyruvate carboxylase).

4. **Role of PEP Carboxylase**:
- PEP carboxylase catalyzes the reaction where carbon dioxide is fixed to phosphoenolpyruvate (PEP) to form oxaloacetate, which is then converted to malate or malic acid.

5. **Conclusion**:
- Therefore, the enzyme responsible for the fixation of \(^{14}CO_2\) in malic acid in the sugarcane plant is **PEP carboxylase**.

### Final Answer:
The enzyme responsible for the fixation of \(^{14}CO_2\) in malic acid in sugarcane is **PEP carboxylase**.