AIPMT PRELIMS2005Botany-Plant Physiology

AIPMT PRELIMS 2005 Botany Photosynthesis MCQ Question

Type: MCQ-conceptual-Medium-Class 11

Photosynthesis in C₄ plants is relatively less limited by atmospheric CO₂ levels because:

A

four carbon acids are the primary initial CO₂ fixation products

B

the primary fixation of CO₂ is mediated via PEP carboxylase

C

effective pumping of CO₂ into bundle sheath cells

D

RUBISCO in C₄ plants has higher affinity for CO₂

Correct Answer

Option B

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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