PEP case and RuBisCo in ` C_(4)` plants are present respectively in

Options

A. Cytoplasm and thylakoids
B. Stroma and Cytoplasm
C. Stroma and thylakoids
D. mesophyll and bundle sheath cells

Answer

To answer the question regarding the location of PEP carboxylase (PEPcase) and RuBisCO in C4 plants, we can break down the information step by step.

### Step-by-Step Solution:

1. **Understanding PEPcase and RuBisCO**:
- PEPcase, or phosphoenolpyruvate carboxylase, is an enzyme that catalyzes the carboxylation of phosphoenolpyruvate (PEP), a 3-carbon compound, to form oxaloacetic acid.
- RuBisCO, or ribulose bisphosphate carboxylase/oxygenase, is an enzyme that catalyzes the carboxylation and oxygenation of ribulose bisphosphate (RuBP), a 5-carbon compound.

2. **Location of PEPcase**:
- In C4 plants, PEPcase is located in the **cytoplasm of mesophyll cells**. This is where the initial carboxylation of PEP occurs, leading to the formation of oxaloacetic acid.

3. **Location of RuBisCO**:
- RuBisCO is found in the **stroma of chloroplasts** within the bundle sheath cells. This is where the secondary fixation of CO2 occurs, combining CO2 with RuBP.

4. **Summary of Locations**:
- PEPcase: **Cytoplasm of mesophyll cells**
- RuBisCO: **Stroma of bundle sheath cells**

5. **Conclusion**:
- Therefore, the correct answer to the question is that PEPcase is present in the cytoplasm of mesophyll cells, and RuBisCO is present in the stroma of bundle sheath cells.

### Final Answer:
PEPcase is present in the cytoplasm of mesophyll cells, and RuBisCO is present in the stroma of bundle sheath cells.

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