AIPMT PRELIMS 2005 Botany Photosynthesis MCQ Question
Photosynthesis in C₄ plants is relatively less limited by atmospheric CO₂ levels because:
four carbon acids are the primary initial CO₂ fixation products
the primary fixation of CO₂ is mediated via PEP carboxylase
effective pumping of CO₂ into bundle sheath cells
RUBISCO in C₄ plants has higher affinity for CO₂
Correct Answer
Detailed Explanation
C₄ plants use PEP carboxylase for the initial fixation of CO₂, which is more efficient under low CO₂ conditions.
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