Fill in the following blanks with suitable words
The roots of small plants grow entirely in the …………. Soil.

Answer

**Step-by-Step Solution:**

1. **Identify the Type of Soil**: The question asks about the type of soil where the roots of small plants grow entirely. We need to think about the layers of soil and which one is most suitable for small plants.

2. **Understand Soil Layers**: Soil is composed of different layers, commonly referred to as horizons. The top layer is known as the "top soil," which is rich in organic matter and nutrients.

3. **Define Top Soil**: Top soil is the uppermost layer of soil, which contains a high concentration of organic material (humus) that is essential for plant growth. It provides the necessary nutrients and moisture that small plants require.

4. **Conclude the Answer**: Based on the understanding that small plant roots grow in the nutrient-rich layer of soil, we can fill in the blank with the word "top."

5. **Final Answer**: The roots of small plants grow entirely in the **top soil**.

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