The C4 photosynthesis pathway helps to provide CO2 to the carboxylase active site of Rubisco in conditions of high O2 concentration.

Question

Quizplus · Accepted Answer

The C4 photosynthesis pathway is an adaptation to high temperatures, high light intensity, and aridity. It involves the fixation of CO2 into four-carbon compounds by PEP carboxylase in mesophyll cells, which are then transported to bundle sheath cells where they release CO2 for the Calvin cycle. This process helps to provide CO2 to the carboxylase active site of Rubisco in conditions of high O2 concentration, reducing photorespiration and improving photosynthetic efficiency.

The C4 Photosynthesis Pathway Helps to Provide CO2 to the Carboxylase