Hydroponics refers to growing plants in

Options

A. Macronutrients culture medium
B. Water
C. Solution of mineral nutrients
D. Soil

Answer

### Step-by-Step Solution:

1. **Understanding Hydroponics**: Hydroponics is a method of growing plants without soil. The term "hydroponics" comes from the Greek words "hydro," meaning water, and "ponics," meaning labor or work. This indicates that water is the primary medium for growing plants in this method.

2. **Identifying the Growing Medium**: In hydroponics, instead of soil, plants are grown in a nutrient-rich solution. This solution contains essential minerals and nutrients that plants need for growth.

3. **Analyzing the Options**:
- **Option 1: Macronutrients culture medium**: This option is incorrect because while macronutrients are important, hydroponics does not refer specifically to a culture medium of macronutrients.
- **Option 2: Water**: This option is partially correct since water is used, but it does not encompass the full definition of hydroponics, which includes nutrient solutions.
- **Option 3: Solution of the mineral nutrients**: This is the correct answer. Hydroponics specifically involves using a solution that contains mineral nutrients dissolved in water to support plant growth.
- **Option 4: Soil**: This option is incorrect because hydroponics is defined by the absence of soil.

4. **Conclusion**: Based on the analysis of the options, the correct answer is that hydroponics refers to growing plants in a solution of mineral nutrients.

### Final Answer:
Hydroponics refers to growing plants in a solution of mineral nutrients.