RuBisCo is an enzyme that acts both as a carboxylase and oxygenase. Why do you think RuBisCo carries out more carboxylation in `C_(4)` plants?

Explanation

**Step-by-Step Solution:**

1. **Understanding RuBisCo**: RuBisCo (Ribulose-1,5-bisphosphate carboxylase/oxygenase) is an enzyme that plays a crucial role in the process of photosynthesis. It can catalyze two reactions: carboxylation (fixing CO2) and oxygenation (fixing O2).

2. **Location of RuBisCo in C4 Plants**: In C4 plants, RuBisCo is not found in the mesophyll cells where initial carbon fixation occurs. Instead, it is located in the bundle sheath cells, which surround the vascular bundles.

3. **Carbon Fixation Process in C4 Plants**: In C4 plants, the initial carbon fixation occurs in the mesophyll cells where phosphoenolpyruvate (PEP) acts as the primary CO2 acceptor. PEP is converted into a 4-carbon compound known as oxaloacetic acid (OAA), which is then converted into malic acid.

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