The enzyme respondsible for carboxylation rection `(CO_(2)` fixation) in ` C_(3)` plants is

Options

A. RuBP oxygenase
B. Pryuvate decarboxlase
C. RuBP carboxylase
D. PEP carboxylase \

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the enzyme responsible for the carboxylation reaction (CO₂ fixation) in C₃ plants.

2. **Identifying the Process**: In C₃ plants, the primary process for fixing CO₂ is known as the Calvin cycle. This cycle consists of three main steps: carboxylation (carbon fixation), reduction, and regeneration.

3. **Focusing on Carboxylation**: The first step of the Calvin cycle is the carboxylation reaction, where atmospheric CO₂ is fixed. This step is crucial for converting CO₂ into organic molecules.

4. **Identifying the Enzyme**: The enzyme that catalyzes the carboxylation reaction in C₃ plants is known as RUBP carboxylase. This enzyme facilitates the reaction between carbon dioxide and ribulose 1,5-bisphosphate (RUBP).

5. **Common Name of the Enzyme**: RUBP carboxylase is commonly referred to as Rubisco. This name is widely recognized in the field of plant biology.

6. **Conclusion**: Therefore, the enzyme responsible for the carboxylation reaction (CO₂ fixation) in C₃ plants is RUBP carboxylase, or Rubisco.

**Final Answer**: The enzyme responsible for carboxylation reaction (CO₂ fixation) in C₃ plants is RUBP carboxylase (Rubisco).

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