TREE PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Takes place at night
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Only occurs when the stomata are closed
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Takes place in the mesophyll
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Takes place in the bundle-sheath cells
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Detailed explanation-1: -In C4 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.
Detailed explanation-2: -In C4 plants, calvin cycle occurs in bundle sheath cells and not in mesophyll cells.
Detailed explanation-3: -C4 plants have a distinctive leaf anatomy (Kranz anatomy), with chloroplast-rich bundle-sheath cells, which form a gas-tight cylinder surrounding the vascular bundle.
Detailed explanation-4: -The large cells around the vascular bundles of C4 plants form bundle sheaths. These cells have a large number of chloroplasts to perform the Calvin cycle. Therefore, this is the correct option.
Detailed explanation-5: -The Calvin cycle takes place in the bundle sheath cells. The initial carboxylation reaction occurs in the mesophyll cells.