New Systematics differs from Classical Systematics in employing

Options

A. Experimental Taxonomy
B. Biochemical and Cytotaxonomy
C. All biological parameters
D. Numerical Taxonomy.

Answer

**Step-by-Step Solution:**

1. **Understanding the Concepts**:
- Classical Systematics primarily relies on morphological characteristics (physical traits) of organisms for classification.
- New Systematics, on the other hand, incorporates a broader range of biological parameters beyond just morphology.

2. **Identifying the Parameters Used**:
- In New Systematics, classification is based on:
- Cytology (study of cells)
- Physiology (study of functions and processes of organisms)
- Biochemistry (study of chemical processes within and related to living organisms)
- Ecology (study of interactions between organisms and their environment)

3. **Focus of Classification**:
- In Classical Systematics, the species is the central unit of classification.
- In New Systematics, there is a shift in focus towards subspecies and populations, recognizing the importance of genetic and ecological diversity.

4. **Use of Experimental and Statistical Methods**:
- New Systematics employs experimental taxonomy, which involves experimental variability to measure various biological parameters.
- It also utilizes numerical taxonomy, which applies statistical methods to analyze relationships among species, helping to understand their evolutionary history.

5. **Conclusion**:
- The key difference between New Systematics and Classical Systematics lies in the comprehensive approach of New Systematics, which integrates multiple biological parameters and methodologies, while Classical Systematics is limited to morphological traits.

**Final Answer**: New Systematics differs from Classical Systematics in employing all biological parameters, including experimental taxonomy, biochemical and cytotaxonomy, and numerical taxonomy.

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