Source of mineral nutrients is

Options

A. soil
B. minerals obtained from rocks
C. rocks
D. all of these

Answer

To answer the question "Source of mineral nutrients is", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- A) Soil
- B) Minerals obtained from rocks
- C) Rock
- D) All of these

2. **Understanding Mineral Nutrients**: Mineral nutrients are essential for plant growth and development. They are primarily sourced from the environment.

3. **Analyzing Each Option**:
- **Soil**: Soil is a significant source of mineral nutrients as it contains various minerals that plants absorb through their roots.
- **Minerals obtained from rocks**: Rocks are the original source of many minerals. When rocks weather and break down, they release minerals that can be absorbed by plants.
- **Rock**: This option is similar to the previous one, emphasizing that rocks themselves are a source of minerals.
- **All of these**: This option suggests that all the previous sources contribute to mineral nutrients.

4. **Conclusion**: Since soil, minerals from rocks, and rocks themselves all contribute to the availability of mineral nutrients, the correct answer is:
- **D) All of these**

### Final Answer:
The source of mineral nutrients is **All of these** (D).