The Question is from neet-botany photosynthesis-in-higher-plants , and it was created by the author D VINOD

Question

The oxygenation activity of ${\rm{RuBisCo}}{\rm{.}}$  enzyme in photorespiration leads to the formation of

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
**Primary Concept**: Photorespiration and the role of RuBisCO
**Related Topics**: Calvin cycle, carbon fixation, oxygenase activity, 3-phosphoglycerate, 2-phosphoglycolate
**Prerequisites**: Knowledge of photosynthesis, the Calvin cycle, and the function of RuBisCO.
## SOLUTION PATHWAY
**Given Information**:
    * The question focuses on the oxygenation activity of RuBisCO during photorespiration.
    * We need to determine the carbon compounds formed during this process.
**Method & Steps**:
  1.  Understand the Reaction: During photorespiration, RuBisCO reacts with oxygen instead of carbon dioxide.
    Reasoning: This oxygenation reaction is a key characteristic of photorespiration.
    Formula/Rule: RuBisCO + O2 --> 2-phosphoglycolate + 3-phosphoglycerate
  2. Identify the Products: The products of this reaction are 2-phosphoglycolate (2-C compound) and 3-phosphoglycerate (3-C compound).
    Working: Only one molecule of 3-phosphoglycerate is produced directly by the oxygenation reaction.
   Key Point: Although 2-phosphoglycolate is a product, it is not one of the options.
  3. Select the Answer: The correct answer is the one that mentions the 3-C compound which is 3-phosphoglycerate.
    Result: One molecule of 3-C compound is formed.
    Verification: The question asks for direct product of the reaction.
## OPTION ANALYSIS
[A] :x: Incorrect. Two molecules of 3-C compound are not directly formed by the oxygenation reaction.
[B] ✓: Correct. One molecule of 3-phosphoglycerate (a 3-C compound) is formed.
[C] :x: Incorrect. No 6-C compound is formed by this reaction.
[D] :x: Incorrect. While a 2-C compound is formed (2-phosphoglycolate), it's paired with a 3-C compound, not a 4-C compound.
## LEARNING AIDS
**Common Mistakes**:
    1.  Confusing products: Confusing the products of the Calvin cycle with the products of photorespiration
        How to avoid: Review the specific reactions of both cycles.
    2.  Overlooking the direct product: Focusing on the subsequent metabolism of the products of photorespiration instead of the initial products.
        How to avoid: Carefully read the question and identify the specific products requested.
**Quick Tips**:
    1. Remember that oxygenation by RuBisCO leads to a 3-C and 2-C compound
    2.  Focus on the direct products of the specific reaction mentioned in the question.

D VINOD · Answer

${\rm{2}}$ molecules of ${\rm{3}}\,{\rm{ - }}\,{\rm{C}}$ compound

D VINOD · Answer

The correct Option is "${\rm{1}}$ molecule of ${\rm{3}}\,{\rm{ - }}\,{\rm{C}}$ compound"

D VINOD · Answer

${\rm{1}}$ molecule of ${\rm{6}}\,{\rm{ - }}\,{\rm{C}}$ compound

D VINOD · Answer

${\rm{1}}$ molecule of ${\rm{4}}\,{\rm{ - }}\,{\rm{C}}$ compound and ${\rm{1}}$ molecule of ${\rm{2}}\,{\rm{ - }}\,{\rm{C}}$ compound

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