Select the incorrect match for `C_(4)` cycle

Options

A. Primary `CO_(2)` fixation product `- PGA`
B. Site for initial carboxylation - mesophyll cells
C. Primary `CO_(2)` acceptor `- PEP`
D. `C_(4)` plant- Maize.

Answer

To solve the question regarding the incorrect match for the C4 cycle, let's analyze the options step by step:

### Step 1: Understand the C4 Cycle
The C4 cycle, also known as the Hatch-Slack pathway, is a photosynthetic process that occurs in certain plants (C4 plants). It involves the fixation of carbon dioxide (CO2) into a four-carbon compound.

### Step 2: Identify Key Components of the C4 Cycle
1. **Primary CO2 Fixation Product**: The first product formed when CO2 is fixed in the C4 cycle is oxaloacetic acid (OAA), not PGA (3-phosphoglycerate).
2. **Site for Initial Carboxylation**: The initial carboxylation of CO2 occurs in mesophyll cells.
3. **Primary CO2 Acceptor**: The primary CO2 acceptor in the C4 cycle is phosphoenolpyruvate (PEP).
4. **Example of C4 Plant**: An example of a C4 plant is maize (corn).

### Step 3: Analyze Each Option
- **Option 1**: Primary CO2 fixation product is PGA. (Incorrect)
- **Option 2**: Site for initial carboxylation is mesophyll cells. (Correct)
- **Option 3**: Primary CO2 acceptor is PEP. (Correct)
- **Option 4**: C4 plant example is maize. (Correct)

### Step 4: Conclusion
The incorrect match in the options provided is:
- **Primary CO2 fixation product is PGA** (This is incorrect; it should be OAA).

### Final Answer
The incorrect match for the C4 cycle is: **Primary CO2 fixation product is PGA**.

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