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

Question

PEPcase has an advantage over RuBisCo. The advantage is

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
**Primary Concept**: Differences between RuBisCo and PEPcase in carbon fixation.
**Related Topics**: Photosynthesis, C3 and C4 pathways, Photorespiration.
**Prerequisites**: Basic knowledge of photosynthesis and the roles of RuBisCo and PEPcase.
## SOLUTION PATHWAY
**Given Information**:
*  The question asks for the advantage of PEPcase over RuBisCo.
*  The correct answer is given as option A.
**Method & Steps**:
1. **Understand the functions:** RuBisCo is the primary enzyme for carbon fixation in most plants, but it can also react with oxygen in a process called photorespiration. PEPcase, on the other hand, does not react with oxygen.
    Reasoning: Understanding the substrate specificity of the two enzymes is crucial.
2. **Analyze the options:**
    Option A directly points to the key difference: RuBisCo’s reaction with oxygen is a disadvantage because it reduces the efficiency of carbon fixation. PEPcase does not have this drawback.
    Option B is incorrect because RuBisCo does not combine with NO2.
    Option C is incorrect because PEPcase is found in C4 plants that are more efficient than C3 plants and thus do conserve energy.
    Option D is incorrect because RuBisCo is found in bundle sheath cells in C4 plants.
3. **Select the correct answer:** Option A correctly identifies the advantage of PEPcase.
    Result: The correct answer is A.
## OPTION ANALYSIS
[A] ✓: RuBisCo can bind with oxygen, leading to photorespiration, which reduces photosynthetic efficiency. PEPcase does not have this limitation.
[B] :x: RuBisCo does not combine with NO2.
[C] :x: PEPcase is part of the more energy-efficient C4 pathway.
[D] :x: RuBisCo is present in both mesophyll and bundle sheath cells in C4 plants.
## LEARNING AIDS
**Common Mistakes**:
1. Confusing the functions of RuBisCo and PEPcase: Remember that RuBisCo can react with both CO2 and O2, while PEPcase only reacts with CO2.
2. Misunderstanding the C3 and C4 pathways: PEPcase is the primary carboxylating enzyme in C4 plants.
**Quick Tips**:
1.  Remember that photorespiration is a wasteful process, and PEPcase avoids it.
2.  Think of PEPcase as a 'better' CO2 fixer under high oxygen conditions.

NISHANTH · Answer

The correct Option is "RuBisCo combines with ${O_2}$but PEPcase do not"

NISHANTH · Answer

RuBisCo combines with N${O_2}$ but PEPcase do not

NISHANTH · Answer

RuBisCo conserve energy but PEPcase do not

NISHANTH · Answer

PEPcase is present in both mesophyll cells and bundle sheath cells but RuBisCo is not

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