Which pair is wrong

Options

A. `C_(3)` plant-Maize
B. Calvin cycle-PGA
C. Hatch-Slack cycle -OAA
D. `C_(4)` plant-Kranz anatomy

Answer

To determine which pair is wrong among the given options, we will analyze each pair step by step.

### Step 1: Analyze the first pair - C3 plant, maize
- **Definition**: C3 plants are those that primarily use the Calvin cycle for photosynthesis and produce a three-carbon compound (3-PGA) as the first stable product.
- **Maize**: Maize (Zea mays) is actually classified as a C4 plant, which means it uses a different pathway (Hatch and Slack pathway) for photosynthesis.
- **Conclusion**: This pair is incorrect because maize is not a C3 plant.

### Step 2: Analyze the second pair - Calvin cycle, PGA
- **Definition**: The Calvin cycle is the process in C3 plants where carbon dioxide is fixed into organic compounds.
- **PGA**: Phosphoglyceric acid (PGA) is indeed the first stable product formed during the Calvin cycle.
- **Conclusion**: This pair is correct.

### Step 3: Analyze the third pair - Hatch and Slack cycle, oxaloacetic acid
- **Definition**: The Hatch and Slack cycle is a pathway used by C4 plants to fix carbon dioxide.
- **Oxaloacetic acid**: This is the first stable product formed in the Hatch and Slack cycle.
- **Conclusion**: This pair is correct.

### Step 4: Analyze the fourth pair - C4 plant, transanatomy
- **Definition**: C4 plants have a special anatomical structure known as transanatomy, which includes mesophyll and bundle sheath cells.
- **Conclusion**: This pair is correct.

### Final Conclusion
The only incorrect pair among the options provided is **C3 plant, maize**. Therefore, the answer to the question is that this pair is wrong.

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