In which of the following, all three are macronutrients

Options

A. Boron, zinc , manganese
B. Iron , copper , molybdenum
C. Molybdenum, magnesium , manganese
D. Nitrogen , magnesium , phosphorus

Answer

To solve the question "In which of the following, all three are macronutrients?", we will analyze each option provided and determine whether they consist of macronutrients or micronutrients.

### Step-by-Step Solution:

1. **Understanding Macronutrients and Micronutrients**:
- Macronutrients are nutrients required by plants in larger quantities. Key examples include:
- Nitrogen (N)
- Phosphorus (P)
- Potassium (K)
- Calcium (Ca)
- Magnesium (Mg)
- Sulfur (S)
- Carbon (C)
- Hydrogen (H)
- Oxygen (O)
- Micronutrients are needed in smaller amounts and include:
- Iron (Fe)
- Zinc (Zn)
- Copper (Cu)
- Manganese (Mn)
- Molybdenum (Mo)
- Boron (B)
- Nickel (Ni)
- Chlorine (Cl)

2. **Analyzing Each Option**:
- **Option 1: Boron, Zinc, Manganese**
- Boron (B) - Micronutrient
- Zinc (Zn) - Micronutrient
- Manganese (Mn) - Micronutrient
- **Conclusion**: All three are micronutrients. This option is incorrect.

- **Option 2: Iron, Copper, Molybdenum**
- Iron (Fe) - Micronutrient
- Copper (Cu) - Micronutrient
- Molybdenum (Mo) - Micronutrient
- **Conclusion**: All three are micronutrients. This option is incorrect.

- **Option 3: Molybdenum, Magnesium, Manganese**
- Molybdenum (Mo) - Micronutrient
- Magnesium (Mg) - Macronutrient
- Manganese (Mn) - Micronutrient
- **Conclusion**: Only one is a macronutrient. This option is incorrect.

- **Option 4: Nitrogen, Magnesium, Phosphorus**
- Nitrogen (N) - Macronutrient
- Magnesium (Mg) - Macronutrient
- Phosphorus (P) - Macronutrient
- **Conclusion**: All three are macronutrients. This option is correct.

3. **Final Answer**:
- The correct option is **Option 4: Nitrogen, Magnesium, Phosphorus**.