The Question is from neet-botany photosynthesis-in-higher-plants , and it was created by the author Mr. NARESH KUMAR K

Question

In photorespiration, RuBP is converted to:

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
 **Primary Concept**: Photorespiration
 **Related Topics**: Calvin cycle, RuBisCO, Glycolate pathway
 **Prerequisites**: Understanding of the Calvin cycle and the role of RuBisCO.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the products of RuBP conversion during photorespiration.
  [Important conditions]: Photorespiration occurs when RuBisCO reacts with O2 instead of CO2.
**Method & Steps**:
 1. Understand the role of RuBisCO in photorespiration.
  Reasoning: RuBisCO, the enzyme responsible for carbon fixation in the Calvin cycle, can also react with oxygen (O2) instead of carbon dioxide (CO2) under certain conditions, leading to photorespiration.
  Formula/Rule:  None directly applicable, but understanding the reaction is key.
 2. Determine the products of the RuBisCO oxygenase reaction.
  Working: When RuBisCO reacts with O2, it catalyzes the oxidation of RuBP (ribulose-1,5-bisphosphate), a 5-carbon compound, producing one molecule of 3-phosphoglycerate (PGA), a 3-carbon compound, and one molecule of 2-phosphoglycolate, a 2-carbon compound.
  Key Point:  The formation of 2-phosphoglycolate is inefficient and reduces the overall efficiency of carbon fixation.
 3. Identify the correct option.
  Result: PGA and phosphoglycolate are the products of RuBP conversion in photorespiration.
  Verification: This aligns with the known biochemistry of photorespiration.
 ## OPTION ANALYSIS
A ✓: PGA and phosphoglycolate are the correct products of the reaction between RuBP and O2 catalyzed by RuBisCO.
B :x: Two molecules of PGA are not formed. Only one molecule of PGA is produced along with one molecule of phosphoglycolate.
C :x: Two molecules of phosphoglycolate are not produced. Only one molecule of phosphoglycolate is formed.
D :x: Oxaloacetate is not a product of this reaction. Oxaloacetate is involved in the C4 pathway, a mechanism to reduce photorespiration.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing photorespiration with the Calvin cycle: Remember that photorespiration is an oxygenase reaction catalyzed by RuBisCO, leading to a wasteful process.
  2.Incorrectly identifying the products: Carefully consider the stoichiometry of the reaction and the products formed.
 **Quick Tips**:
  1.Remember that photorespiration is a competing reaction to carbon fixation, reducing the efficiency of photosynthesis.
  2.Associate RuBisCO with both carboxylase (Calvin cycle) and oxygenase (photorespiration) activities.

Mr. NARESH KUMAR K · Answer

The correct Option is "PGA and phosphoglycolate"

Mr. NARESH KUMAR K · Answer

Two molecules of PGA

Mr. NARESH KUMAR K · Answer

Two molecules of phosphoglycolate

Mr. NARESH KUMAR K · Answer

PGA and oxaloacetate

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