Based on the Hatch and slack pathway , which of the following compounds are found in mesophylls and bundle sheath cells, respectively ?

Options

A. PEPcase , RuBisCO
B. PEP, ATPase
C. RuBisCo, PEPcase
D. PEP, RuBisCO

Answer

To solve the question regarding the compounds found in mesophyll and bundle sheath cells based on the Hatch and Slack pathway (C4 pathway), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the C4 Pathway**: The Hatch and Slack pathway, also known as the C4 pathway, is a method of carbon fixation in certain plants. It involves two types of cells: mesophyll cells and bundle sheath cells.

2. **Identify Compounds in Mesophyll Cells**: In mesophyll cells, the primary carbon dioxide acceptor is phosphoenolpyruvate (PEP). When carbon dioxide is fixed by PEP, it forms a four-carbon compound called oxaloacetic acid.

3. **Conversion in Mesophyll Cells**: The oxaloacetic acid is then converted into another four-carbon compound, malic acid, which is transported to the bundle sheath cells.

4. **Identify Compounds in Bundle Sheath Cells**: In the bundle sheath cells, the enzyme ribulose bisphosphate carboxylase/oxygenase (rubisco) is present. This enzyme catalyzes the reaction where malic acid releases a carbon dioxide molecule and forms a three-carbon compound.

5. **Conclusion**: Therefore, the compound found in mesophyll cells is PEP, and the compound found in bundle sheath cells is rubisco.

6. **Select the Correct Option**: Based on the above information, the correct answer is option 4: PEP in mesophyll cells and rubisco in bundle sheath cells.

### Final Answer:
The correct answer is: **PEP in mesophyll cells and rubisco in bundle sheath cells.**

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