Question

In $C_4$ plants, Calvin cycle occurs in

• A. Stroma of bundle sheath chloroplast
• B. Mesophyll chloroplast
• C. Grana of bundle sheath chloroplast
• D. Does not occur as $C{O}_2$ is fixed mainly by PEP and no $C{O}_2$ is left for Calvin cycle

Answer 1

Answer: (A)

Stroma of bundle sheath chloroplast

In $C_4$ plants the photosynthesis takes place in a thin-walled mesophyll cell and a 4-carbon acid is handed off to a thick-walled bundle sheath cell, where the Calvin cycle occurs in a chloroplast of that second cell. This protects Calvin cycle from the effects of photorespiration.