Which of the following is not correctly matched?

Options

A. Calvin cycle in bundle sheath cells - Maize
B. HSK pathway -OAA
C. Photorespiration - Less productivity
D. RuBisCO - kranz anatomy

Answer

To solve the question "Which of the following is not correctly matched?", we need to analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify the Options**: We need to look at the options provided in the question. Each option will relate to a specific biological process or structure.

2. **Evaluate Each Option**:
- **Option 1: Calvin cycle in bundle sheath cells in maize**:
- The Calvin cycle primarily occurs in the stroma of chloroplasts. However, in C4 plants like maize, the Calvin cycle does occur in the bundle sheath cells. Therefore, this option is correctly matched.

- **Option 2: HSK pathway leads to the formation of OAA**:
- The HSK pathway, also known as the Hatch-Slack pathway, is involved in the C4 photosynthetic process and leads to the formation of oxaloacetic acid (OAA). This option is correctly matched.

- **Option 3: Photorespiration leads to less productivity**:
- Photorespiration is a process that occurs when the enzyme RuBisCO uses oxygen instead of carbon dioxide, leading to a loss of fixed carbon and reduced sugar synthesis. This option is also correctly matched as photorespiration does indeed lead to less productivity.

- **Option 4: Rubisco is a Kranz anatomy**:
- Kranz anatomy refers to the specialized structure of C4 plants that helps in efficient photosynthesis, particularly to minimize photorespiration. However, Rubisco itself is an enzyme and not a structure. Therefore, this option is not correctly matched.

3. **Conclusion**: Based on the analysis, the option that is not correctly matched is **Option 4: Rubisco is a Kranz anatomy**.

### Final Answer:
The option that is not correctly matched is **Option 4**.