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

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

AIPMTAIPMT 2005Photosynthesis in Higher Plants

Solution:

In C4 plants the cost of concentrating CO2 within the bundle sheath cell is 2ATP per CO2. Energetics of the C4 photosynthetic carbon cycle