Which one of the following element is important for nitrogen fixation ?

Options

A. Zn
B. B
C. Mo
D. Cu

Answer

To solve the question regarding which element is important for nitrogen fixation, we can follow these steps:

### Step 1: Understand Nitrogen Fixation
Nitrogen fixation is the process of converting atmospheric nitrogen (N₂) into a form that can be used by living organisms, such as ammonia (NH₃), nitrate (NO₃⁻), or nitrite (NO₂⁻). This process is essential for plant growth since plants cannot utilize atmospheric nitrogen directly.

**Hint:** Remember that nitrogen fixation is crucial for converting atmospheric nitrogen into usable forms for plants.

### Step 2: Identify the Role of Enzymes
The process of nitrogen fixation is facilitated by specific enzymes. The most important enzyme involved in this process is called nitrogenase. This enzyme is responsible for the conversion of nitrogen gas into ammonia.

**Hint:** Focus on the role of enzymes in biochemical processes, particularly nitrogen fixation.

### Step 3: Conditions for Nitrogenase Activity
Nitrogenase operates under anaerobic conditions, meaning it requires an environment devoid of oxygen to function effectively. This is a critical aspect of the nitrogen fixation process.

**Hint:** Consider the environmental conditions necessary for the activity of nitrogen-fixing enzymes.

### Step 4: Determine the Composition of Nitrogenase
The nitrogenase enzyme is a complex that includes molybdenum and iron. Molybdenum is a key component of this enzyme and is essential for its activity in the nitrogen fixation process.

**Hint:** Pay attention to the specific elements that are part of the nitrogenase enzyme complex.

### Step 5: Evaluate the Given Options
The question provides four options: zinc, boron, molybdenum, and copper. Based on our understanding, molybdenum is the element that is crucial for the nitrogenase enzyme and, consequently, for the nitrogen fixation process.

**Hint:** Compare the options with the information gathered about the role of molybdenum in nitrogen fixation.

### Conclusion
The correct answer to the question "Which one of the following element is important for nitrogen fixation?" is **molybdenum**.

**Final Answer:** Molybdenum