Chlorosis and etiolation

Explanation

### Step-by-Step Solution:

1. **Definition of Chlorosis**:
- Chlorosis is a physiological condition in plants characterized by the yellowing of leaves. This yellowing occurs due to a deficiency of essential mineral elements, primarily magnesium and iron.

2. **Causes of Chlorosis**:
- The primary cause of chlorosis is the lack of certain nutrients in the soil. When plants do not receive adequate amounts of these minerals, their chlorophyll production is affected, leading to the yellowing of leaves.

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