Which one of the following is not an essential mineral element for plants

Options

A. Fe
B. Mn
C. Cd
D. P

Answer

To determine which of the following is not an essential mineral element for plants, we can follow these steps:

### Step 1: Understand Essential Mineral Elements
Essential mineral elements for plants are categorized into two main types: macronutrients and micronutrients. Macronutrients are required in larger quantities, while micronutrients are needed in smaller amounts.

### Step 2: Identify Macronutrients
The macronutrients essential for plants include:
- Carbon (C)
- Hydrogen (H)
- Oxygen (O)
- Nitrogen (N)
- Phosphorus (P)
- Sulfur (S)
- Potassium (K)
- Calcium (Ca)
- Magnesium (Mg)

### Step 3: Identify Micronutrients
The micronutrients essential for plants include:
- Iron (Fe)
- Manganese (Mn)
- Copper (Cu)
- Molybdenum (Mo)
- Zinc (Zn)
- Boron (B)
- Chlorine (Cl)
- Nickel (Ni)

### Step 4: Evaluate the Options
Now, we need to evaluate the options given in the question to identify which one is not essential for plants.

### Step 5: Identify Non-Essential Elements
Among the elements mentioned, cadmium (Cd) is not classified as either a macronutrient or a micronutrient. It is considered a non-essential element for plants.

### Conclusion
Thus, the answer to the question "Which one of the following is not an essential mineral element for plants?" is **cadmium**.

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