What is the role fo molybdenum?

Options

A. Nitrogen fixation
B. Flower induction
C. Chromosome contraction
D. Carbon assimilation

Answer

**Step-by-Step Solution:**

1. **Identify Molybdenum as a Micronutrient:**
- Molybdenum is classified as a micronutrient essential for plant growth. It is required in small amounts compared to macronutrients.

2. **Form in Plants:**
- In plants, molybdenum is primarily taken up in the form of molybdate ions (MoO4^2-).

3. **Role in Enzymatic Reactions:**
- Molybdenum plays a crucial role in the functioning of several enzymes. It is a key component of enzymes that are involved in nitrogen metabolism.

4. **Nitrogenase Enzyme:**
- One of the most important enzymes that contain molybdenum is nitrogenase. This enzyme is responsible for the fixation of atmospheric nitrogen (N2) into ammonia (NH3).

5. **Nitrogen Fixation Process:**
- The nitrogenase enzyme facilitates the conversion of nitrogen gas (N2) into ammonia (NH3), which is a vital process for nitrogen metabolism in plants.

6. **Involvement in Nitrate Reduction:**
- Molybdenum is also involved in other enzymatic processes, such as nitrate reduction, which is essential for the utilization of nitrate by plants.

7. **Conclusion:**
- The primary role of molybdenum in plants is in nitrogen fixation and nitrogen metabolism, making it essential for the growth and development of plants.

**Final Answer:**
The role of molybdenum in plants is primarily in nitrogen fixation and nitrogen metabolism, particularly through its involvement in the enzyme nitrogenase.

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