Define active absorption of minerals.

Explanation

### Step-by-Step Solution:

1. **Definition of Active Absorption**: Active absorption of minerals refers to the process by which plants take up mineral ions from the soil.

2. **Uptake Against Concentration Gradient**: This process occurs against the concentration gradient, meaning that the concentration of mineral ions inside the plant root cells is lower than that in the surrounding soil solution. Therefore, the plant must work to move these ions into the cells.

3. **Energy Requirement**: Since the uptake is against the concentration gradient, it requires energy. This energy is typically provided in the form of adenosine triphosphate (ATP).

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