Question

the first product of co2 fixation in C4 plants on ooa
oxaloactic acid is formed in agranal chloroplasts ​

Answer 1

Answer:

Most of the plants that are adapted to dry tropical regions have the C

4

pathway. These plants are called C

4

plants. Sugarcane, Maize, Sorghum, Corn, etc. are the examples of these plants. In these plants, double fixation of carbon dioxide occurs by C

4

pathway. The first CO

2

acceptor is a three-carbon molecule phosphoenolpyruvate (PEP) and it is present in mesophyll cells. The enzyme that catalyzes this CO

2

fixation is PEP carboxylase or PEPcase. The mesophyll cells of C

4

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 C

4

acids are broken down to release CO

2

and a three-carbon molecule.

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