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In leaves of C4 plants malic acid synthesis during CO2 fixation occurs in

1. epidermal cells
2. mesophyll cells
3. bundle sheath
4. guard cells

Correct answer: mesophyll cells

Solution

In C4 plants, CO2 is first fixed in mesophyll cells into a 4-carbon compound such as oxaloacetate, which is then converted to malate (malic acid). The bundle sheath cells mainly receive and decarboxylate this compound for the Calvin cycle.

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