RE-NEET 2026 Botany Photorespiration MCQ Question
Photorespiration reaction catalyzed by RuBisCo is shown below : RuBP + O₂ → 3-Phosphoglycerate + X Identify “X” from the given options :
2-phosphoglycolate
Oxaloacetate
Malate
Phosphoenolpyruvate
Correct Answer
Detailed Explanation
In the photorespiration process, RuBisCo catalyzes the reaction between ribulose bisphosphate (RuBP) and oxygen (O₂), leading to the production of 3-phosphoglycerate and 2-phosphoglycolate (X). The formation of 2-phosphoglycolate occurs when RuBisCo reacts with O₂ instead of CO₂, which is a key aspect of photorespiration.
The other options fail because:
- Oxaloacetate, malate, and phosphoenolpyruvate are not products of the RuBisCo reaction with O₂, but rather intermediates in other metabolic pathways like the Calvin cycle or C4 photosynthesis. Thus, they do not fit the context of this specific reaction.
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