In `C_(4)` plants, RuBisCO is present in :

Options

A. Mesophyll cells only
B. Bundle sheath cells only
C. Both (a) and (b)
D. Neither (a) nor (b)

Answer

To answer the question "In C4 plants, RuBisCO is present in:", we can follow these steps:

### Step-by-Step Solution:

1. **Understand C4 Plants**: C4 plants have a unique photosynthetic pathway that allows them to efficiently fix carbon dioxide, especially in conditions where other plants may struggle, such as high temperatures and low carbon dioxide concentrations.

2. **Identify the Anatomy**: C4 plants exhibit a specialized leaf anatomy known as Kranz anatomy. This involves two types of cells: mesophyll cells and bundle sheath cells.

3. **Function of Mesophyll Cells**: In C4 plants, mesophyll cells are primarily involved in the light reactions of photosynthesis. These cells capture sunlight and convert it into chemical energy.

4. **Role of Bundle Sheath Cells**: The bundle sheath cells surround the vascular bundles and are where the Calvin cycle (C3 cycle) occurs. This is the cycle that directly uses RuBisCO to fix carbon dioxide into organic molecules.

5. **Presence of RuBisCO**: RuBisCO, the enzyme responsible for fixing carbon dioxide in the Calvin cycle, is not present in the mesophyll cells of C4 plants. Instead, it is located exclusively in the bundle sheath cells.

6. **Conclusion**: Therefore, in C4 plants, RuBisCO is present in the bundle sheath cells.

### Final Answer:
In C4 plants, RuBisCO is present in the **bundle sheath cells**.

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