An element essential for nitrogen metabolism is

Options

A. K
B. Mo
C. Mg
D. Mn

Answer

To determine the element essential for nitrogen metabolism, we can follow these steps:

### Step 1: Understand the Question
We need to identify which element among the given options is crucial for nitrogen metabolism.

### Step 2: Analyze the Options
The options provided are:
1. Potassium
2. Molybdenum
3. Magnesium
4. Manganese

### Step 3: Review Each Element's Role
- **Potassium**: While important for various plant functions, it is not specifically essential for nitrogen metabolism.
- **Molybdenum**: This element is known to be a key component of enzymes involved in nitrogen metabolism, such as nitrogenase and nitrate reductase. It is absorbed from the soil as molybdate ions and is crucial for nitrogen fixation.
- **Magnesium**: This element is vital for chlorophyll production and enzyme function but is not directly involved in nitrogen metabolism.
- **Manganese**: This element plays a role in photosynthesis and enzyme activation but is not specifically linked to nitrogen metabolism.

### Step 4: Identify the Correct Answer
Based on the analysis, the element that is essential for nitrogen metabolism is **Molybdenum**.

### Final Answer
The element essential for nitrogen metabolism is **Molybdenum**.

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