Biosystematics aims at

Options

A. The classification of organisms based on broad morphological characters
B. Delimiting various taxa of organisms and establishing their relationships
C. The classification of organisms based on their evolutionary history and establishing their phylogeny on the totality of various parameters from all fields of studies
D. Identification and arrangement of organisms on the basis of their cytological characteristics

Answer

### Step-by-Step Solution:

1. **Understanding Biosystematics**:
- Biosystematics is a branch of biology that focuses on the classification of organisms based on their evolutionary relationships and history. It integrates various biological disciplines to understand the diversity of life.

2. **Evaluating the Options**:
- **Option 1**: "Classification of organisms based on broad morphological characteristics."
- This refers to artificial classification, which is not the primary focus of biosystematics. Therefore, this option is incorrect.

- **Option 2**: "Delimiting various types of organisms and establishing their relationship."
- This pertains more to taxonomy, which is the science of naming and classifying organisms. While related, it does not specifically define biosystematics. Thus, this option is also incorrect.

- **Option 3**: "Classification of organisms based on their evolutionary history and phylogeny."
- This option accurately describes biosystematics. It emphasizes the evolutionary relationships and phylogenetic connections among organisms, making it the correct choice.

- **Option 4**: "Identification and rearrangement of organisms based on cytological characteristics."
- This relates to cytotaxonomy, which focuses on the classification based on cellular characteristics. Hence, this option is incorrect as well.

3. **Conclusion**:
- The correct answer is **Option 3**, as it aligns with the principles of biosystematics by focusing on evolutionary history and phylogenetic relationships.