AIIMS 2019 Botany C₃ and C₄ Pathways MCQ Question
What is the site of C₃ cycle in C₃ and C₄ plants
In C₃ plant– mesophyll cell and In C₄ plant–Bundle sheath cell.
In C₃ plant–Bundle sheath cell and In C₄ plant–mesophyll cell.
In C₃ plant– Bundle sheath cell and In C3 plant–Bundle
In C₃ plant– mesophyll cell and In C4 plant–mesophyll cell.
Correct Answer
Detailed Explanation
In C₃ plants, the C₃ cycle, also known as the Calvin cycle, occurs in the mesophyll cells where CO₂ is fixed into a 3-carbon compound (3-phosphoglycerate) using ribulose bisphosphate (RuBP) and the enzyme RuBisCO. In C₄ plants, the initial fixation of CO₂ occurs in the mesophyll cells, forming a 4-carbon compound (oxaloacetate), which is then transported to the bundle sheath cells where the C₃ cycle takes place, allowing for efficient carbon fixation under high light and temperature conditions. Option B is incorrect because it misplaces the locations of the C₃ cycle in both plant types, while options C and D are not applicable as they provide no relevant information.
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Identify the incorrect statement with respect to Calvin cycle
Assertion: CO₂ is transported from mesophyll cells to bundle sheath of chloroplasts in C₄ plants. Reason: RuBP is called final acceptor in C₄ plants.