How are the terms 'critical concentration' and 'deficient' different from each other in terms of concentration of an essential element in plants ?
Can you find the values of 'critical concentration' and 'deficient' for minerals -Fe and Zn ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Critical Concentration**: This is the specific concentration level of an essential nutrient below which plant growth is adversely affected. It serves as a threshold; if the nutrient concentration falls below this level, the plant's growth will be retarded.
- **Deficient**: This term refers to a state where the concentration of an essential nutrient is below the critical concentration. It indicates a deficiency condition where the nutrient is insufficient for the plant's needs.

2. **Difference Between Critical Concentration and Deficient**:
- The critical concentration is a specific threshold level for nutrient concentration. If the concentration is above this level, the plant can grow normally.
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