Classification based on chromosome number, structure and behaviour is called

Options

A. Numerical taxonomy
B. Cytotaxonomy
C. Phylogenetic taxonomy
D. Chemotaxonomy

Answer

To solve the question regarding the classification based on chromosome number, structure, and behavior, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Taxonomy**:
- Taxonomy is the science of classification of living organisms. It involves organizing species into categories based on shared characteristics.

**Hint**: Remember that taxonomy is a broad field that encompasses various methods of classification.

2. **Identify the Types of Taxonomy Mentioned**:
- The question provides four options: Numerical taxonomy, Cytotaxonomy, Phylogenetic taxonomy, and Chemotaxonomy. We need to understand what each type focuses on.

**Hint**: Break down each term to understand its focus area.

3. **Analyze Each Type of Taxonomy**:
- **Numerical Taxonomy**: This method uses a variety of characteristics (morphological, physiological, anatomical) and applies mathematical or computerized methods to classify organisms.
- **Cytotaxonomy**: This specifically involves the study of cells, focusing on chromosome number, structure, and behavior.
- **Phylogenetic Taxonomy**: This method classifies organisms based on their evolutionary relationships, often using morphological and genetic data.
- **Chemotaxonomy**: This classification is based on the chemical composition of organisms, particularly in plants, focusing on metabolites.

**Hint**: Focus on the keywords in the question: "chromosome number, structure, and behavior."

4. **Match the Question with the Correct Type of Taxonomy**:
- The question specifically asks for classification based on chromosome number, structure, and behavior. This directly aligns with the definition of Cytotaxonomy.

**Hint**: Look for the option that directly mentions chromosomes.

5. **Select the Correct Answer**:
- Based on the analysis, the correct answer is **B. Cytotaxonomy**.

**Hint**: Confirm that the selected option matches the criteria outlined in the question.

### Final Answer:
The classification based on chromosome number, structure, and behavior is called **Cytotaxonomy**.