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C4 plants
plants that avoid photorespiration with spatial separation of steps
C4 spatial separation
CO₂ fixation occurs in mesophyll cells; Calvin cycle occurs in bundle sheath cells
mesophyll cell function (C4)
fix CO₂ into a 4-carbon molecule
4-carbon molecule transport
4-carbon molecule moves to bundle sheath cells
bundle sheath cell function
releases concentrated CO₂ for use in the Calvin cycle
C4 benefit
high CO₂ levels around rubisco prevent photorespiration