### Step-by-Step Solution:
1. **Understanding Classification**: Classification of organisms involves organizing them into groups based on shared characteristics. This can include morphological, anatomical, and cytological features.
2. **Cytological Information**: Cytological information refers to the study of cells, including their structure, function, and behavior. In the context of classification, it includes aspects such as:
- **Cell Wall Composition**: The type of cell wall (if present) can vary among different groups of organisms (e.g., cellulose in plants, chitin in fungi).
- **Pigments**: The presence of specific pigments can help differentiate between groups (e.g., chlorophyll in plants).
- **Reserved Food**: Different organisms store energy in different forms (e.g., starch in plants, glycogen in animals).
- **Chromosome Number**: The number of chromosomes can vary widely among species and can be a key factor in classification.
- **Chromosome Structure and Behavior**: This includes how chromosomes are organized and how they behave during cell division.
3. **Cytotaxonomy**: This is a branch of taxonomy that specifically uses cytological information for classification. It focuses on the characteristics mentioned above, particularly chromosome number and structure.
4. **Chemotaxonomy and Phylogenetic Classification**: While these are also important in classification, they rely on chemical constituents and evolutionary relationships, respectively, and are not the focus of this particular question.
5. **Conclusion**: The correct answer to the question is that classification of organisms is based on cytological information such as chromosome number, structure, and behavior.
### Final Answer:
The classification of organisms is based on cytological information like chromosome number, structure, and behavior.
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