In sugarcane plant, `^14CO_(2)` is fixed in malic acid, in which the enzyme that fixes `CO_(2)` is

Options

A. fuctose phosphatase
B. ribulose bisphosphate carboxylase
C. phosphoenol pyruvic acid carboxylase
D. ribulose phosphate kinase

Explanation

To solve the question regarding the enzyme that fixes CO2 in the sugarcane plant, we can follow these steps:

### Step 1: Identify the type of plant
Sugarcane is classified as a C4 plant. C4 plants have a specific mechanism for carbon fixation that differs from C3 plants.

**Hint:** Remember the classification of plants based on their photosynthetic pathways.

### Step 2: Understand the carbon fixation process in C4 plants
In C4 plants, carbon dioxide (CO2) is initially fixed into a four-carbon compound. This process occurs in the mesophyll cells of the plant.

**Hint:** Focus on the initial products formed during carbon fixation in C4 plants.

### Step 3: Know the role of PEP
In C4 photosynthesis, the enzyme that catalyzes the reaction between CO2 and phosphoenolpyruvate (PEP) is crucial. PEP is a three-carbon compound that acts as the primary acceptor of CO2.

**Hint:** Recall the significance of PEP in the carbon fixation pathway of C4 plants.

### Step 4: Identify the enzyme responsible for CO2 fixation
The enzyme that catalyzes the reaction of CO2 with PEP to form oxaloacetate is called PEP carboxylase. This enzyme is specific to C4 plants and is responsible for the initial fixation of CO2.

**Hint:** Look for the enzyme that specifically works with PEP in the context of C4 photosynthesis.

### Step 5: Conclude the answer
Based on the above steps, the correct answer to the question is that the enzyme that fixes CO2 in malic acid in sugarcane is **PEP carboxylase**.

**Final Answer:** PEP carboxylase.