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

  • mesophyll

  • bundle sheath

  • phloem

  • epidermis

Answer

A.

mesophyll

The oxalic acid is reduced to malic acid in mesophyll cells, from chloroplast of mesophyll cells the malic acid is transferred to the chloroplast of bundle sheath cells where it is decarboxylated to form CO2 and pyruvic acid. 

The oxalic acid is reduced to malic acid in mesophyll cells, from chloroplast of mesophyll cells the malic acid is transferred to the chloroplast of bundle sheath cells where it is decarboxylated to form CO2 and pyruvic acid.