Which pair is wrong

Options

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

Answer

To determine which pair is wrong in the context of photosynthesis in higher plants, we will analyze each of the provided statements step by step.

### Step-by-Step Solution:

1. **Identify the Statements**: We need to examine the statements provided in the options. The statements relate to various aspects of photosynthesis, including pathways and plant types.

2. **Examine the Fourth Option**: The statement claims that the Hatch and Slack pathway is also known as the oxaloacetic acid pathway.
- **Analysis**: This is a true statement. The Hatch and Slack pathway is indeed associated with the formation of oxaloacetic acid (OAA) in C4 plants.

3. **Examine the Kelvin Cycle**: The next statement claims that the Kelvin cycle is also known as the PGA cycle.
- **Analysis**: This is also a true statement. The Kelvin cycle (or Calvin cycle) involves the formation of phosphoglycerate (PGA) as one of its key intermediates.

4. **Examine the C4 Plant Anatomy**: The statement mentions that C4 plants have Kranz anatomy.
- **Analysis**: This is true. C4 plants, such as maize and sorghum, exhibit Kranz anatomy, which is an adaptation for efficient photosynthesis in high temperatures.

5. **Examine the Examples of C4 and C3 Plants**: The statement provides examples of C4 and C3 plants.
- **Analysis**: Maize and sorghum are correctly identified as C4 plants. However, the statement also mentions mustard and spinach as examples of C3 plants, which is correct.

6. **Identify the Wrong Statement**: The analysis shows that all statements provided are true. However, the first option is indicated as the wrong statement, which claims that maize is a C4 plant. This is incorrect because maize is indeed a C4 plant, but the question may have been misinterpreted.

7. **Conclusion**: The question may have been misleading, but based on the analysis, all statements are accurate regarding the classification of plants and their respective pathways.

### Final Answer:
The first option is incorrectly stated as wrong, as maize is correctly classified as a C4 plant.