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Question
In the leaves of C4 plants, malic acid synthesis during CO2 fixation occurs in
In the leaves of C4 plants, malic acid synthesis during CO2 fixation occurs in
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Solution
The correct option is C Mesophyll.
C4 plants almost never saturate with light and under hot, dry conditions much outperform C3 plants. They use a two-stage process, where CO2 is fixed in thin-walled mesophyll cells to form a 4-carbon intermediate, typically malate (malic acid). The reaction involves phosphoenolpyruvate (PEP), which fixes CO2 in a reaction catalyzed by PEP-carboxylate. It forms an oxaloacetic acid (OAA), which is quickly converted to malic acid. The 4-carbon acid is actively pumped across the cell membrane into a thick-walled bundle sheath cell where it is split to CO2and a 3-carbon compound.
C4 plants almost never saturate with light and under hot, dry conditions much outperform C3 plants. They use a two-stage process, where CO2 is fixed in thin-walled mesophyll cells to form a 4-carbon intermediate, typically malate (malic acid).
The reaction involves phosphoenolpyruvate (PEP), which fixes CO2 in a reaction catalyzed by PEP-carboxylate. It forms an oxaloacetic acid (OAA), which is quickly converted to malic acid. The 4-carbon acid is actively pumped across the cell membrane into a thick-walled bundle sheath cell where it is split to CO2and a 3-carbon compound.
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