Class NEET 2026 ALL Q #1994
COMPETENCY BASED
APPLY
4 Marks 2026 NTA-RE-NEET-2026 MCQ SINGLE
Photorespiration reaction catalyzed by RuBisCo is shown below: RuBP + $O_{2}$ $\rightarrow$ 3-Phosphoglycerate + X. Identify "X" from the given options
(A) Malate
(B) Phosphoenolpyruvate
(C) 2-Phosphoglycolate
(D) Oxaloacetate
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Correct Answer: C

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Detailed Solution

Step 1: Understanding Photorespiration

Photorespiration is a wasteful process occurring in C3 plants where the enzyme RuBisCo acts as an oxygenase instead of a carboxylase. When RuBisCo binds with $O_{2}$ instead of $CO_{2}$, it reacts with Ribulose-1,5-bisphosphate (RuBP).

Step 2: Analyzing the Reaction

The oxygenation reaction of RuBP is represented as: $$RuBP + O_{2} \rightarrow 3\text{-Phosphoglycerate} (3\text{-PGA}) + 2\text{-Phosphoglycolate}$$ Here, 3-PGA is a 3-carbon compound, and 2-Phosphoglycolate is a 2-carbon compound.

Step 3: Identifying X

Comparing the given reaction equation with the standard biochemical pathway, the product labeled as X is 2-Phosphoglycolate.

Final Answer: 2-Phosphoglycolate

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must recall specific biochemical pathway products and apply that knowledge to identify the missing component in a chemical equation.
Knowledge Dimension: FACTUAL
Justification: The question tests the recall of specific metabolic intermediates involved in the C2 cycle (photorespiration) as defined in the NCERT Biology curriculum.
Syllabus Audit: In the context of NEET, this is classified as COMPETENCY. This question assesses the student's ability to interpret biochemical reactions, which is a core requirement for the NEET Biology syllabus under the unit 'Plant Physiology'.

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