Calvin cycle operates in chloroplasts. Where does Hatch-Slack pathway occur

Options

A. Mitochondria
B. Golgi bodies
C. Chloroplasts
D. Cytoplasm.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks where the Hatch-Slack pathway occurs, given that the Calvin cycle operates in chloroplasts.

2. **Identifying the Pathway**: The Hatch-Slack pathway, also known as the C4 pathway, is a process of carbon fixation that occurs in certain plants.

3. **Location of the Hatch-Slack Pathway**: The Hatch-Slack pathway occurs in the chloroplasts of C4 plants. This is similar to the Calvin cycle, which also occurs in chloroplasts.

4. **Details of the Process**:
- The Hatch-Slack pathway was discovered by two Australian scientists, Hatch and Slack.
- It involves the fixation of carbon dioxide, primarily using a three-carbon molecule called phosphoenolpyruvate (PEP) as the primary carbon dioxide acceptor.
- The enzyme that catalyzes this reaction is PEP carboxylase.
- In C4 plants, the initial carbon fixation occurs in mesophyll cells, where oxaloacetic acid is formed and then converted into malic acid.
- This malic acid is transported to bundle sheath cells, where it is broken down to release carbon dioxide for use in the Calvin cycle.

5. **Conclusion**: Therefore, the correct answer to the question is that the Hatch-Slack pathway occurs in chloroplasts.

**Final Answer**: The Hatch-Slack pathway occurs in chloroplasts.

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