Cytotaxonomy is a form of

Options

A. Classical systematics
B. New systematics
C. Morpho-systematics
D. All the above.

Answer

### Step-by-Step Solution:

1. **Understanding Cytotaxonomy**:
- Cytotaxonomy is a branch of taxonomy that focuses on the study of the cellular characteristics of organisms, particularly their chromosomes. It helps in determining phylogenetic relationships based on cellular data.

2. **Identifying the Options**:
- The options provided are:
- Classical systematics
- New systematics
- Morphosystematics
- All of the above

3. **Differentiating Between Classical and New Systematics**:
- Classical systematics relies solely on morphological characteristics (physical traits) of organisms for classification.
- New systematics incorporates both morphological and cytological (cellular) data, allowing for a more comprehensive understanding of phylogenetic relationships.

4. **Analyzing the Role of Cytotaxonomy**:
- Since cytotaxonomy includes the study of chromosomes and their behavior, it aligns with the principles of new systematics, which integrates both morphological and cytological data.

5. **Eliminating Incorrect Options**:
- Classical systematics is ruled out because it does not consider cytological data.
- Morphosystematics is also ruled out as it focuses primarily on morphological traits without incorporating cytological information.
- The option "All of the above" is incorrect because not all the options are valid for cytotaxonomy.

6. **Conclusion**:
- The only correct answer is "New systematics," as it encompasses the principles of cytotaxonomy.

### Final Answer:
Cytotaxonomy is a form of **New Systematics**.

---