Pick out wrong combination

Options

A. `Fe^(+2) to `haemoglobin
B. `Mg^(2+) to ` photosynthesis
C. `Se^(2+) to `Kreb cycle
D. `Co^(+2) to `vitamin B-1,2

Answer

To solve the question "Pick out the wrong combination," we need to analyze the given combinations and identify which one is incorrect.

### Step-by-Step Solution:

1. **Identify the Elements and Their Functions**:
- **Fe²⁺ (Iron)**: This is known to be a crucial component of hemoglobin, which is responsible for oxygen transport in the blood.
- **Mg²⁺ (Magnesium)**: This element is essential for photosynthesis as it is a central atom in chlorophyll, the green pigment in plants that captures light energy.
- **Vitamin B12**: This vitamin contains cobalt, which is vital for the production of red blood cells and maintenance of the nervous system.
- **Crop Cycle**: This term typically refers to the series of processes that occur in cellular respiration, particularly the Krebs cycle (or citric acid cycle), which is not directly associated with Fe²⁺.

2. **Evaluate Each Combination**:
- **Fe²⁺ and Hemoglobin**: This is a correct combination.
- **Mg²⁺ and Photosynthesis**: This is also a correct combination.
- **Vitamin B12 and Cobalt**: This is a correct combination.
- **Fe²⁺ and Crop Cycle**: This is an incorrect combination because the crop cycle is associated with the Krebs cycle, which involves mitochondrial processes, not directly with Fe²⁺.

3. **Conclusion**:
- The wrong combination is **Fe²⁺ and Crop Cycle**.

### Final Answer:
The wrong combination is **Fe²⁺ and Crop Cycle**.

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