Which of the following is not used as taxonomic aid?

Options

A. Zoological park
B. Soil
C. Herbarium
D. Museum

Answer

**Step-by-Step Solution:**

1. **Understanding Taxonomic Aids**: Taxonomic aids are tools or resources that help in the identification, classification, and study of organisms. Common taxonomic aids include herbaria, botanical gardens, museums, and zoological parks.

2. **Analyzing the Options**:
- **Zoological Park**: These are facilities where animals are kept in controlled environments for conservation, education, and research. They serve as taxonomic aids by allowing the study of animal species.
- **Soil**: Soil is a natural element that provides habitat and nutrients for organisms but does not serve as a taxonomic aid for classification or identification of species.
- **Herbarium**: This is a collection of preserved plant specimens that are used for scientific study and classification. It is a crucial taxonomic aid.
- **Museum**: Museums often house collections of biological specimens, including fossils and preserved organisms, which are used for research and education, making them taxonomic aids.

3. **Identifying the Correct Answer**: Among the options provided, soil does not function as a taxonomic aid. Therefore, the correct answer is **soil**.

**Final Answer**: Soil is not used as a taxonomic aid.

---