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In C4-pathway initial carbon dioxide fixation occurs in chloroplasts of
In C4-pathway initial carbon dioxide fixation occurs in chloroplasts of
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Solution
The correct option is B Mesophyll
C4 pathway is called so because it is found in C4 plants. It is a cyclic process. It is also known as a Hatch-Slack pathway. In C4 pathway, initial carbon dioxide fixation occurs in chloroplasts of mesophyll because primary CO2 acceptor phosphoenolpyruvate (PEP) is present in the mesophyll. PEP (phosphoenolpyruvate) is a three-carbon molecule. The enzyme that catalyzes this CO2 fixation is PEP carboxylase or PEPcase. The mesophyll cells of C4 plants lack the enzyme RuBisCO. The 4-carbon oxaloacetic acid (OAA) is formed in the mesophyll cells which is further converted into the malic acid or aspartic acid and then transported into bundle sheath cells. In the bundle sheath cells, these C4 acids are broken down to release CO2 and a three-carbon molecule.
C4 pathway is called so because it is found in C4 plants. It is a cyclic process. It is also known as a Hatch-Slack pathway. In C4 pathway, initial carbon dioxide fixation occurs in chloroplasts of mesophyll because primary CO2 acceptor phosphoenolpyruvate (PEP) is present in the mesophyll. PEP (phosphoenolpyruvate) is a three-carbon molecule. The enzyme that catalyzes this CO2 fixation is PEP carboxylase or PEPcase. The mesophyll cells of C4 plants lack the enzyme RuBisCO. The 4-carbon oxaloacetic acid (OAA) is formed in the mesophyll cells which is further converted into the malic acid or aspartic acid and then transported into bundle sheath cells. In the bundle sheath cells, these C4 acids are broken down to release CO2 and a three-carbon molecule.
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