Critical elements :

Options

A. Which are in more concentration in soil
B. Which are commonly deficient in soil
C. Whch are absent in soil
D. None of the above

Answer

### Step-by-Step Solution:

1. **Understanding Critical Elements**:
- Critical elements in the context of mineral nutrition refer to essential nutrients that are crucial for plant growth and development. These elements are often required in larger quantities and can become deficient in the soil.

2. **Identifying the Options**:
- The question provides four options regarding critical elements:
1. Elements that are more concentrated in soil.
2. Elements that are commonly deficient in soil.
3. Elements that are absent in soil.
4. None of the above.

3. **Defining Critical Elements**:
- Critical elements are typically macronutrients that are essential for plants but are often found in low concentrations in the soil, leading to deficiencies.

4. **Listing Common Critical Elements**:
- The three primary macronutrients that are commonly deficient in soil are:
- Nitrogen (N)
- Phosphorus (P)
- Potassium (K)

5. **Conclusion**:
- Based on the definition and the common deficiencies of these macronutrients, the correct answer to the question is:
- **Option 2: Which are commonly deficient in soil**.