As compared to a C3-plant, how many additional molecules of ATP are needed for net production of one

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As compared to a C3-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4-plants

Accepted Answer

In C4-plants every CO2 molecules has to be fixed twice, so these plants are needed more energy for the synthesis of hexose sugar molecules than C3-plants in which CO2 has to be fixed only one. 18 ATP molecules are required by C3-plants for the synthesis of one molecules of hexose sugar while 30 ATP molecules are needed by the C4-plants for the same. Thus C4-plants have a need of 12 ATP molecules extra then C3-plantsfor synthesis of one molecules of hexose sugar.

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