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

Question

Which of the following statement is false in case of (${C_4} - $  plant)?

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
**Primary Concept**: C4 Photosynthesis
**Related Topics**: Carbon fixation, Plant anatomy, Enzyme function
**Prerequisites**: Basic understanding of photosynthesis, plant cell types
## SOLUTION PATHWAY
**Given Information**:
*   The question is about C4 plants and their unique photosynthetic pathway.
*   We need to identify the false statement among the given options.
**Method & Steps**:
1.  **Understand C4 Photosynthesis**: C4 plants have a spatial separation of initial CO2 fixation and the Calvin cycle. CO2 is initially fixed in mesophyll cells by PEP carboxylase, not RuBisCO.
    Reasoning: C4 pathway is characterized by two carboxylation steps
    Formula/Rule: N/A
2. **Analyze Option A**: Option A states that RuBisCO is the CO2 acceptor in mesophyll cells. This is incorrect as the initial acceptor in mesophyll cells is phosphoenolpyruvate (PEP) which is converted to oxaloacetate.
    Working:  RuBisCO is present in bundle sheath cells, not mesophyll cells, in C4 plants.
    Key Point: This is the key difference between C3 and C4 plants.
3.  **Analyze Option B**: Option B states that carboxylation occurs in mesophyll cells. This is true, as PEP carboxylase fixes CO2 in mesophyll cells.
    Working: This is the first step of the C4 pathway
    Key Point: Initial carbon fixation happens in the mesophyll cells.
4.  **Analyze Option C**: Option C states that leaves have two cell types. This is also true. C4 leaves have mesophyll cells and bundle sheath cells.
    Working: C4 anatomy is characterized by the presence of these two cell types.
    Key Point: This is the basis of spatial separation of carbon fixation
5.  **Analyze Option D**: Option D states that mesophyll cells lack Rubisco. This is also true. Rubisco is primarily found in bundle sheath cells in C4 plants.
    Working: The C4 pathway is designed to concentrate CO2 in bundle sheath cells.
    Key Point: This prevents photorespiration.
6.  **Conclusion**: Option A is the false statement.
    Result: A
    Verification: The other statements are all true for C4 plants.
## OPTION ANALYSIS
[A] ✓: The initial CO2 acceptor in mesophyll cells of C4 plants is PEP carboxylase, not RuBisCO. RuBisCO is present in the bundle sheath cells where the Calvin cycle takes place.
[B] :x: Carboxylation, by PEP carboxylase, does happen in mesophyll cells
[C] :x: C4 leaves do have two cell types namely mesophyll cells and bundle sheath cells
[D] :x: Rubisco is not present in mesophyll cells in C4 plants, but in the bundle sheath cells. 
## LEARNING AIDS
**Common Mistakes**:
1. [Confusing C3 and C4 pathways]: The key difference lies in the initial CO2 acceptor and the location of RuBisCO.
   How to avoid: Carefully review the steps and locations in each pathway.
2. [Misidentifying cell types]: Understanding the roles of mesophyll and bundle sheath cells is crucial.
   How to avoid: Draw diagrams and label the cell types and reactions.
**Quick Tips**:
1. [Remember PEP carboxylase]: PEP carboxylase is the initial CO2 fixer in C4 mesophyll cells.
2. [Bundle Sheath = Calvin Cycle]: In C4 plants, the Calvin cycle occurs in the bundle sheath cells.

B VENKAT · Answer

The correct Option is "$C{O_2}$ acceptor is RuBisCo in mesosphyll cell"

B VENKAT · Answer

Carboxylation occurs in mesophyll cells

B VENKAT · Answer

Leaves have two cell types

B VENKAT · Answer

Mesophyll cells lack Rubisco

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