AIIMS 2014 Botany Plant Physiology MCQ Question
The C4 plants differ from C3 plants with reference to the
substrate that accepts CO₂ in carbon assimilation
type of end product
type of pigment involved in photosynthesis
number of ATP that are consumed in preparing sugar
Correct Answer
Detailed Explanation
C4 plants differ from C3 plants primarily in the substrate that accepts CO₂ during carbon fixation. In C3 plants, the enzyme RuBisCO catalyzes the reaction with ribulose bisphosphate (RuBP), while in C4 plants, phosphoenolpyruvate (PEP) is the initial acceptor, forming oxaloacetate. This adaptation allows C4 plants to efficiently capture CO₂ in low concentrations and is particularly advantageous in hot, arid environments.
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