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In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of

1. bundle sheath
2. phloem
3. epidermis
4. mesophyll

Correct answer: mesophyll

Solution

In C4 plants, the initial fixation of CO2 happens in mesophyll cells, where PEP carboxylase converts CO2 into a 4-carbon compound such as oxaloacetate, which is then converted to malic acid. The bundle sheath cells receive this compound later for the Calvin cycle.

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