Serum tests for knowing relationships come under

Options

A. Experimental taxonomy
B. Chemotaxonomy
C. Biochemical taxonomy
D. Cytotaxonomy

Answer

To solve the question "Serum tests for knowing relationships come under," we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the classification method that involves serum tests to determine relationships among organisms.

2. **Analyzing the Options**:
- **Option A: Experimental Taxonomy**: This method involves classification based on experimental data, such as origin and pH. However, it does not specifically relate to serum tests. Therefore, this option is incorrect.

- **Option B: Chemotaxonomy**: This approach focuses on the chemical composition of organisms to classify them. Since serum tests are not primarily about chemical classification, this option is also incorrect.

- **Option C: Biochemical Taxonomy**: This method uses biochemical tests, including serum tests, to understand relationships among organisms. Since serum tests analyze proteins and other biochemical markers, this is the correct answer.

- **Option D: Cytotaxonomy**: This classification is based on cellular structures and cytoplasm. It does not involve serum tests, making this option incorrect as well.

3. **Conclusion**: The correct answer is **Biochemical Taxonomy**, as it directly relates to the use of serum tests to determine relationships among organisms.

### Final Answer:
**Biochemical Taxonomy**