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In C4 plants, Calvin cycle operates in

1. Stroma of bundle sheath chloroplasts
2. Grana of bundle sheath chloroplasts
3. Grana of mesophyll chloroplasts
4. Stroma of mesophyll chloroplasts

Correct answer: Stroma of bundle sheath chloroplasts

Solution

In C4 plants, the first CO2 fixation happens in mesophyll cells, but the Calvin cycle occurs later in bundle sheath cells where CO2 is released and concentrated. The Calvin cycle enzymes are located in the stroma of bundle sheath chloroplasts.

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