An ion which is the component of hydrogenase and ureae enzyme and also helpful mobilization of nitrogen

Options

A. `Ni^(+)`
B. `Zn^(++)`
C. `Cu^(++)`
D. `Mg^(++)`

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for an ion that is a component of the enzymes hydrogenase and urease, and that also aids in the mobilization of nitrogen.

2. **Understand the Role of Enzymes**:
- Hydrogenase is an enzyme that facilitates the conversion of hydrogen gas into protons and electrons, which is important in various metabolic processes.
- Urease is an enzyme that catalyzes the hydrolysis of urea into ammonia and carbon dioxide, playing a crucial role in nitrogen metabolism.

3. **Identify Relevant Nutrients**:
- Nutrients are classified into macronutrients and micronutrients. Macronutrients are needed in larger quantities (e.g., nitrogen, phosphorus, potassium), while micronutrients are required in smaller amounts (e.g., iron, manganese, nickel).

4. **Focus on Micronutrients**:
- Among the micronutrients, nickel is known to be a vital component of certain enzymes, including urease and hydrogenase.

5. **Confirm Nickel's Role**:
- Nickel is essential for the proper functioning of urease and hydrogenase enzymes. It also plays a significant role in the mobilization of nitrogen within plants.

6. **Conclusion**:
- Based on the information gathered, the ion that is a component of hydrogenase and urease enzymes and aids in nitrogen mobilization is **nickel**.

**Final Answer**: The correct answer is **Nickel**.

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